chore(deps): bump actions/checkout in the github-actions group

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


Updates `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
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
 
     steps:
       - name: Check out repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Set up mise
         uses: jdx/mise-action@v4

.github/workflows/pdf-signer.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
       - name: Check out repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Set up Python
         uses: actions/setup-python@v6