Bump actions/checkout from 5 to 6 (#558)

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](actions/checkout@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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/CD.yml

@@ -23,7 +23,7 @@ jobs:
       BOT_HOME_DIR: /home/csc
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         show-progress: false
 

.github/workflows/CI.yml

@@ -26,7 +26,7 @@ jobs:
       pull-requests: write
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         show-progress: false
         fetch-depth: 0
@@ -57,7 +57,7 @@ jobs:
       image-digest: ${{ steps.build.outputs.digest }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         show-progress: false
 
@@ -120,7 +120,7 @@ jobs:
       name: e2e
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         show-progress: false