Bump actions/setup-python in /.github/workflows in the actions group

Bumps the actions group in /.github/workflows with 1 update: [actions/setup-python](https://github.com/actions/setup-python).


Updates `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
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci_tests_run_notebooks.yml

@@ -48,7 +48,7 @@ jobs:
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55  #v5.5.0
+      uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065  #v5.6.0
       with:
         python-version: ${{ matrix.python-version }}