Bump actions/setup-python from 5.5.0 to 5.6.0

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5.5.0 to 5.6.0.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@8d9ed9a...a26af69)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: 5.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/pr.yml

@@ -24,7 +24,7 @@ jobs:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Ubuntu dependencies
       run: scripts/install-doxygen.sh
-    - uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5.5.0
+    - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
       with:
         python-version: '3.10'
         cache: 'pip'
@@ -187,7 +187,7 @@ jobs:
     if: ${{ github.ref == 'refs/heads/main' }}
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-    - uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5.5.0
+    - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
       with:
         python-version: '3.10'
         cache: 'pip'