Bump actions/upload-artifact from 4 to 5

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/python.yml

@@ -86,7 +86,7 @@ jobs:
           FISH_AUDIO_API_KEY: ${{ secrets.FISH_AUDIO_API_KEY }}
 
       - name: Upload Test Artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         if: always()
         with:
           name: test-audio-output
@@ -105,7 +105,7 @@ jobs:
       - name: Check package
         run: uv run python -c "import fishaudio; print(f'fishaudio v{fishaudio.__version__}')"
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: dist
           path: dist/