chore(deps): bump actions/checkout from 6 to 7 (#51)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build-proxy.yml

@@ -62,7 +62,7 @@ jobs:
           exe: .exe
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - name: Install dependencies
       run: |

.github/workflows/test-elisp.yml

@@ -35,7 +35,7 @@ jobs:
           experimental: true
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - uses: jcs090218/setup-emacs@master
       with: