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/CICD.yml

@@ -35,7 +35,7 @@ jobs:
     name: Extract crate metadata
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Extract crate information
       id: crate_metadata
       run: |
@@ -58,7 +58,7 @@ jobs:
     - uses: dtolnay/rust-toolchain@stable
       with:
         components: rustfmt
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - run: cargo fmt -- --check
 
   min_version:
@@ -67,7 +67,7 @@ jobs:
     needs: crate_metadata
     steps:
     - name: Checkout source code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Install rust toolchain (v${{ needs.crate_metadata.outputs.msrv }})
       uses: dtolnay/rust-toolchain@master
@@ -83,7 +83,7 @@ jobs:
     name: License checks
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         submodules: true # we especially want to perform license checks on submodules
     - run: tests/scripts/license-checks.sh
@@ -93,7 +93,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
     - name: Git checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         submodules: true # we need all syntax and theme submodules
     - name: Install Rust toolchain
@@ -122,7 +122,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
     - name: Git checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Prepare environment variables
       run: |
         echo "BAT_SYSTEM_CONFIG_PREFIX=$GITHUB_WORKSPACE/tests/examples/system_config" >> $GITHUB_ENV
@@ -138,7 +138,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
     - name: Git checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@stable
     - name: Check documentation
@@ -152,7 +152,7 @@ jobs:
     name: cargo audit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: cargo audit
 
   build:
@@ -178,7 +178,7 @@ jobs:
       BUILD_CMD: cargo
     steps:
     - name: Checkout source code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Install prerequisites
       shell: bash