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] <support@github.com>

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
           tar -C $HOME/.local/bin -xvf source-to-image.tar.gz
 
       - name: Checkout the repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Update base image
         if: ${{ inputs.snapshot }}

.github/workflows/merge-rules.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout the repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Get Commit Message

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
           sudo apt-get install gcc libkrb5-dev pass &&
           sudo pip install docker==5.0.3 docker-squash cekit odcs[client] packaging==21.3
       - name: Checkout the repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Create release tag
         if: ${{ github.event_name == 'workflow_dispatch' }}

.github/workflows/update.yml

@@ -42,7 +42,7 @@ jobs:
 
     steps:
       - name: Checkout the repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up the repo
         run: |