build(deps): bump actions/setup-python from 5 to 6 (#21175)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/_build-packages.yml

@@ -26,7 +26,7 @@ jobs:
         pkg-name: ${{ fromJSON(inputs.pkg-names) }}
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.x"
 

.github/workflows/ci-pkg-install.yml

@@ -47,7 +47,7 @@ jobs:
         python-version: ["3.9", "3.11"]
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
       - uses: actions/download-artifact@v5

.github/workflows/code-checks.yml

@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
 

.github/workflows/docs-build.yml

@@ -70,7 +70,7 @@ jobs:
           # only Pytorch has/uses notebooks
           submodules: ${{ matrix.pkg-name == 'pytorch' }}
           lfs: ${{ matrix.pkg-name == 'pytorch' }}
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.10"
 

.github/workflows/release-nightly.yml

@@ -24,7 +24,7 @@ jobs:
       PKG_NAME: "lightning"
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.9
 

.github/workflows/release-pkg.yml

@@ -55,7 +55,7 @@ jobs:
       tag: ${{ steps.lai-package.outputs.version }}
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PYTHON_VER }}
       - name: install Package