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](actions/setup-python@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] <[email protected]>

Author: dependabot[bot]

.github/workflows/build-single-product-part.yml

@@ -224,7 +224,7 @@ jobs:
           STAGE: ${{ inputs.stage }}
       - name: setup python
         if: ${{ steps.get-parameters.outputs.type == 'api' }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ secrets.PYTHON_VERSION || env.PYTHON_VERSION }}
           # cache: 'pip' Disable cache as uv is probably faster anyways: https://github.com/actions/setup-python/issues/822

.github/workflows/build-workspace-product-part.yml

@@ -123,7 +123,7 @@ jobs:
           registry-url: ${{ env.NPM_REGISTRY }}
       - name: setup python
         if: ${{ steps.get-parameters.outputs.type == 'api' }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ secrets.PYTHON_VERSION || env.PYTHON_VERSION }}
           # TODO: This fails with Error: No file in ..._product matched to [**/requirements.txt]