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/gnu-data.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repo
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
 
     - name: Set up Python
       uses: actions/setup-python@v6
@@ -42,10 +42,10 @@ jobs:
         sudo apt-get install jq python3-pandas python3-matplotlib python3-seaborn fonts-dejavu-core
 
     - name: Checkout repo
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
 
     - name: Checkout uutils/coreutils for unsafe counting
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
       with:
         repository: uutils/coreutils
         path: uutils-coreutils