Update GitHub actions (major) (#59)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[actions/download-artifact](https://redirect.github.com/actions/download-artifact)
| action | major | `v5` -> `v6` |
|
[actions/upload-artifact](https://redirect.github.com/actions/upload-artifact)
| action | major | `v4` -> `v5` |

---

### Release Notes

<details>
<summary>actions/download-artifact (actions/download-artifact)</summary>

###
[`v6`](https://redirect.github.com/actions/download-artifact/compare/v5...v6)

[Compare
Source](https://redirect.github.com/actions/download-artifact/compare/v5...v6)

</details>

<details>
<summary>actions/upload-artifact (actions/upload-artifact)</summary>

###
[`v5`](https://redirect.github.com/actions/upload-artifact/compare/v4...v5)

[Compare
Source](https://redirect.github.com/actions/upload-artifact/compare/v4...v5)

</details>

---

### Configuration

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schedule defined).

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are satisfied.

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rebase/retry checkbox.

👻 **Immortal**: This PR will be recreated if closed unmerged. Get
[config
help](https://redirect.github.com/renovatebot/renovate/discussions) if
that's undesired.

---

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

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Author: renovate[bot]

.github/workflows/integration_test_charm.yaml

@@ -73,7 +73,7 @@ jobs:
         # Default test results in case the integration tests time out or runner set up fails
         # (So that Allure report will show "unknown"/"failed" test result, instead of omitting the test)
         if: ${{ github.event_name == 'schedule' && github.run_attempt == '1' }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: allure-default-results-integration-test-${{ inputs.path-to-charm-directory }}
           path: ${{ inputs.path-to-charm-directory }}/allure-default-results/
@@ -114,7 +114,7 @@ jobs:
           go install github.com/snapcore/spread/cmd/spread@latest
       - name: Download packed charm(s)
         timeout-minutes: 5
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           pattern: ${{ inputs.artifact-prefix }}-*
           merge-multiple: true
@@ -136,7 +136,7 @@ jobs:
         # Allure can only process one result per pytest test ID. If parameterization is done via
         # spread instead of pytest, there will be overlapping pytest test IDs.
         if: ${{ (success() || (failure() && steps.spread.outcome == 'failure')) && startsWith(matrix.job.spread_job, 'github-ci:ubuntu-24.04:') && endsWith(matrix.job.spread_job, ':juju36') && github.event_name == 'schedule' && github.run_attempt == '1' }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: allure-results-integration-test-${{ inputs.path-to-charm-directory }}-${{ matrix.job.name_in_artifact }}
           path: ${{ inputs.path-to-charm-directory }}/artifacts/${{ matrix.job.spread_job }}/allure-results/
@@ -177,7 +177,7 @@ jobs:
       - name: Upload logs
         timeout-minutes: 5
         if: ${{ !contains(matrix.job.spread_job, 'juju29') && (success() || (failure() && steps.spread.outcome == 'failure')) }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: logs-integration-test-${{ inputs.path-to-charm-directory }}-${{ matrix.job.name_in_artifact }}
           path: ~/logs/

.github/workflows/integration_test_charms.yaml

@@ -59,13 +59,13 @@ jobs:
       - name: Download default test results
         # Default test results in case the integration tests time out or runner set up fails
         # (So that Allure report will show "unknown"/"failed" test result, instead of omitting the test)
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           path: allure-default-results/
           pattern: allure-default-results-integration-test-*
           merge-multiple: true
       - name: Download test results
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           path: allure-results/
           pattern: allure-results-integration-test-*