Bump actions/checkout in /.github/workflows in the actions group

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


Updates `actions/checkout` from 6.0.0 to 6.0.1
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@1af3b93...8e8c483)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/ci_publish.yml

@@ -25,7 +25,7 @@ jobs:
     name: Publish HTML
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3  #v6.0.0
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  #v6.0.1
 
       - name: Setup Python
         uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548  #v6.1.0

.github/workflows/ci_tests_run_notebooks.yml

@@ -46,7 +46,7 @@ jobs:
             os: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3  # v6.0.0
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  # v6.0.1
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@83679a892e2d95755f2dac6acb0bfd1e9ac5d548  #v6.1.0
       with: