build(deps): Bump actions/setup-python from 5 to 6

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5 to 6.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build.yml

@@ -340,7 +340,7 @@ jobs:
 
       - name: Install Python 3.x
         if: fromJSON(matrix.config.container) == null && runner.name != 'WINDOWS-SIGN-PC'
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.11.x'
 

.github/workflows/test-javascript.yml

@@ -92,7 +92,7 @@ jobs:
 
       # See: https://github.com/eclipse-theia/theia/blob/master/doc/Developing.md#prerequisites
       - name: Install Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.11.x'