chore(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] <support@github.com>

Author: dependabot[bot]

.github/workflows/R-CMD-check.yml

@@ -53,7 +53,7 @@ jobs:
         with:
           r-version: ${{ matrix.config.r }}
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.config.python-version }}
           architecture: 'x64' 

.github/workflows/pkgdown.yml

@@ -37,7 +37,7 @@ jobs:
         with:
           use-public-rspm: true
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.11'
           architecture: 'x64'

.github/workflows/test-coverage.yml

@@ -28,7 +28,7 @@ jobs:
         with:
           use-public-rspm: true
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.13'
           architecture: 'x64'