Bump actions/checkout from 6 to 7 (#8)

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-and-push.yml

@@ -21,7 +21,7 @@ jobs:
         runs-on: ubuntu-24.04
         steps:
             - name: Checkout
-              uses: actions/checkout@v6
+              uses: actions/checkout@v7
 
             - name: Login to GHCR
               uses: docker/login-action@v4
@@ -52,7 +52,7 @@ jobs:
         runs-on: ubuntu-24.04-arm
         steps:
             - name: Checkout
-              uses: actions/checkout@v6
+              uses: actions/checkout@v7
 
             - name: Login to GHCR
               uses: docker/login-action@v4
@@ -85,7 +85,7 @@ jobs:
         runs-on: ubuntu-24.04
         steps:
             - name: Checkout
-              uses: actions/checkout@v6
+              uses: actions/checkout@v7
 
             - name: Login to GHCR
               uses: docker/login-action@v4