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/build-images.yml

@@ -20,7 +20,7 @@ jobs:
     name: ${{ matrix.destination-image }} image / ${{ matrix.base-image }} release
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
         with:

.github/workflows/owasp.yml

@@ -25,7 +25,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: master
     

.github/workflows/shellcheck.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master

.github/workflows/snyk-container-analysis.yml

@@ -18,7 +18,7 @@ jobs:
   snyk:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Build a Docker image
       run: docker build -t privatebin/nginx-fpm-alpine .
     - name: Run Snyk to check Docker image for vulnerabilities

.github/workflows/trivy-analysis.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: "ubuntu-20.04"
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Build an image from Dockerfile
         run: |