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/release.yml

@@ -23,7 +23,7 @@ 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
           cache: pip

.github/workflows/test-docs.yml

@@ -25,7 +25,7 @@ jobs:
           # commit with the main branch and previous releases.
           fetch-depth: 0
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.10"
 

.github/workflows/test-ssh.yml

@@ -126,7 +126,7 @@ jobs:
           docker run ipyparallel-sshd ping -n 1 $env:computername
 
       - name: Install Python ${{ matrix.python }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python }}
           cache: pip

.github/workflows/test.yml

@@ -105,7 +105,7 @@ jobs:
 
       - name: Install Python ${{ matrix.python }}
         if: ${{ matrix.cluster_type != 'mpi' }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python }}