chore(deps): update actions/checkout action to v4.2.1 (openapi-generators#1134)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://redirect.github.com/actions/checkout) |
action | patch | `v4.2.0` -> `v4.2.1` |

---

### Release Notes

<details>
<summary>actions/checkout (actions/checkout)</summary>

###
[`v4.2.1`](https://redirect.github.com/actions/checkout/blob/HEAD/CHANGELOG.md#v421)

[Compare
Source](https://redirect.github.com/actions/checkout/compare/v4.2.0...v4.2.1)

- Check out other refs/\* by commit if provided, fall back to ref by
[@&#8203;orhantoy](https://redirect.github.com/orhantoy) in
[https://github.com/actions/checkout/pull/1924](https://redirect.github.com/actions/checkout/pull/1924)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

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View the [repository job
log](https://developer.mend.io/github/openapi-generators/openapi-python-client).

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.github/workflows/checks.yml

@@ -15,7 +15,7 @@ jobs:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4.2.0
+      - uses: actions/checkout@v4.2.1
       - name: Set up Python
         uses: actions/setup-python@v5.2.0
         with:
@@ -77,7 +77,7 @@ jobs:
     needs: test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4.2.0
+      - uses: actions/checkout@v4.2.1
       - uses: actions/setup-python@v5
         with:
           python-version: "3.12"
@@ -127,7 +127,7 @@ jobs:
         ports:
           - "3000:3000"
     steps:
-      - uses: actions/checkout@v4.2.0
+      - uses: actions/checkout@v4.2.1
       - name: Set up Python
         uses: actions/setup-python@v5.2.0
         with:

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
     permissions:
       id-token: write
     steps:
-      - uses: actions/checkout@v4.2.0
+      - uses: actions/checkout@v4.2.1
       - name: Install Hatchling
         run: pip install --upgrade hatchling
       - name: Build