Bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/containerized-ci.yml

@@ -34,7 +34,7 @@ jobs:
     #
     # Checks-out repository under $GITHUB_WORKSPACE
     #
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     # Set up conda environment
     - name: Setup conda environment
       uses: conda-incubator/setup-miniconda@v4.0.1

.github/workflows/continuous_integration.yml

@@ -60,7 +60,7 @@ jobs:
     # Initial steps
     ###############################################################################
     # Checks-out repository under $GITHUB_WORKSPACE
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     # Set up conda environment
     - name: Setup conda environment
       uses: conda-incubator/setup-miniconda@v4.0.1