Update charmcraft.yaml build tools (#56)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [pip](https://redirect.github.com/pypa/pip)
([changelog](https://pip.pypa.io/en/stable/news/)) | `25.2` -> `25.3` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/pip/25.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pip/25.2/25.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
| [uv](https://pypi.org/project/uv/)
([source](https://redirect.github.com/astral-sh/uv),
[changelog](https://redirect.github.com/astral-sh/uv/blob/main/CHANGELOG.md))
| `0.9.4` -> `0.9.5` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/uv/0.9.5?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/uv/0.9.4/0.9.5?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>pypa/pip (pip)</summary>

### [`v25.3`](https://redirect.github.com/pypa/pip/compare/25.2...25.3)

[Compare
Source](https://redirect.github.com/pypa/pip/compare/25.2...25.3)

</details>

<details>
<summary>astral-sh/uv (uv)</summary>

###
[`v0.9.5`](https://redirect.github.com/astral-sh/uv/blob/HEAD/CHANGELOG.md#095)

[Compare
Source](https://redirect.github.com/astral-sh/uv/compare/0.9.4...0.9.5)

Released on 2025-10-21.

This release contains an upgrade to `astral-tokio-tar`, which addresses
a vulnerability in tar extraction on malformed archives with mismatching
size information between the ustar header and PAX extensions. While the
`astral-tokio-tar` advisory has been graded as "high" due its potential
broader impact, the *specific* impact to uv is **low** due to a lack of
novel attacker capability. Specifically, uv only processes tar archives
from source distributions, which already possess the capability for full
arbitrary code execution by design, meaning that an attacker gains no
additional capabilities through `astral-tokio-tar`.

Regardless, we take the hypothetical risk of parser differentials very
seriously. Out of an abundance of caution, we have assigned this upgrade
an advisory:
<GHSA-w476-p2h3-79g9>

##### Security

- Upgrade `astral-tokio-tar` to 0.5.6 to address a parsing differential
([#&#8203;16387](https://redirect.github.com/astral-sh/uv/pull/16387))

##### Enhancements

- Add required environment marker example to hint
([#&#8203;16244](https://redirect.github.com/astral-sh/uv/pull/16244))
- Fix typo in MissingTopLevel warning
([#&#8203;16351](https://redirect.github.com/astral-sh/uv/pull/16351))
- Improve 403 Forbidden error message to indicate package may not exist
([#&#8203;16353](https://redirect.github.com/astral-sh/uv/pull/16353))
- Add a hint on `uv pip install` failure if the `--system` flag is used
to select an externally managed interpreter
([#&#8203;16318](https://redirect.github.com/astral-sh/uv/pull/16318))

##### Bug fixes

- Fix backtick escaping for PowerShell
([#&#8203;16307](https://redirect.github.com/astral-sh/uv/pull/16307))

##### Documentation

- Document metadata consistency expectation
([#&#8203;15683](https://redirect.github.com/astral-sh/uv/pull/15683))
- Remove outdated aarch64 musl note
([#&#8203;16385](https://redirect.github.com/astral-sh/uv/pull/16385))

</details>

---

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kubernetes/charmcraft.yaml

@@ -25,10 +25,10 @@ parts:
       # Use environment variable instead of `--break-system-packages` to avoid failing on older
       # versions of pip that do not recognize `--break-system-packages`
       # `--user` needed (in addition to `--break-system-packages`) for Ubuntu >=24.04
-      PIP_BREAK_SYSTEM_PACKAGES=true python3 -m pip install --user --upgrade pip==25.2  # renovate: charmcraft-pip-latest
+      PIP_BREAK_SYSTEM_PACKAGES=true python3 -m pip install --user --upgrade pip==25.3  # renovate: charmcraft-pip-latest
 
       # Use uv to install poetry so that a newer version of Python can be installed if needed by poetry
-      curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.4/uv-installer.sh | sh  # renovate: charmcraft-uv-latest
+      curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.5/uv-installer.sh | sh  # renovate: charmcraft-uv-latest
       # poetry 2.0.0 requires Python >=3.9
       if ! "$HOME/.local/bin/uv" python find '>=3.9'
       then

machines/charmcraft.yaml

@@ -25,10 +25,10 @@ parts:
       # Use environment variable instead of `--break-system-packages` to avoid failing on older
       # versions of pip that do not recognize `--break-system-packages`
       # `--user` needed (in addition to `--break-system-packages`) for Ubuntu >=24.04
-      PIP_BREAK_SYSTEM_PACKAGES=true python3 -m pip install --user --upgrade pip==25.2  # renovate: charmcraft-pip-latest
+      PIP_BREAK_SYSTEM_PACKAGES=true python3 -m pip install --user --upgrade pip==25.3  # renovate: charmcraft-pip-latest
 
       # Use uv to install poetry so that a newer version of Python can be installed if needed by poetry
-      curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.4/uv-installer.sh | sh  # renovate: charmcraft-uv-latest
+      curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/uv/releases/download/0.9.5/uv-installer.sh | sh  # renovate: charmcraft-uv-latest
       # poetry 2.0.0 requires Python >=3.9
       if ! "$HOME/.local/bin/uv" python find '>=3.9'
       then