Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [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/v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/CICD.yml

@@ -18,7 +18,7 @@ jobs:
     name: Extract crate metadata
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Extract crate information
       id: crate_metadata
       run: |
@@ -49,7 +49,7 @@ jobs:
     - uses: dtolnay/rust-toolchain@stable
       with:
         components: rustfmt
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - run: cargo fmt -- --check
 
   min_version:
@@ -58,7 +58,7 @@ jobs:
     needs: crate_metadata
     steps:
     - name: Checkout source code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Install rust toolchain (v${{ needs.crate_metadata.outputs.msrv }})
       uses: dtolnay/rust-toolchain@master
@@ -94,7 +94,7 @@ jobs:
       BUILD_CMD: cargo
     steps:
     - name: Checkout source code
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Install prerequisites
       shell: bash