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](https://github.com/actions/checkout/compare/v3...v4)

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

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

.github/workflows/trivy-analysis.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Build an image from Dockerfile
         run: |

.github/workflows/update-base-image.yml

@@ -36,7 +36,7 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: "Checkout repository"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
       - 
         name: "Get p2pool Release Tag"
         id: get_tag

.github/workflows/update-image-on-push.yml

@@ -38,7 +38,7 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: "Checkout repository"
-        uses: "actions/checkout@v3"
+        uses: "actions/checkout@v4"
       - 
         name: "Get p2pool Release Tag"
         id: get_tag