Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     outputs:
       version: ${{ steps.version-step.outputs.version }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Extract current version
         id: version-step
@@ -25,7 +25,7 @@ jobs:
     name: Files
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Generate variants
         run: ./images/yourls/bin/generate-variants.sh dist/
@@ -91,7 +91,7 @@ jobs:
       matrix:
         variant: [fpm-alpine, fpm, apache]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: docker-library/official-images
 

.github/workflows/hub.yml

@@ -10,7 +10,7 @@ jobs:
     name: Stackbrew
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: dist
 
@@ -37,7 +37,7 @@ jobs:
     needs:
       - stackbrew
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: docker-library/official-images