Bump actions/checkout from 4 to 6 in /.github/workflows

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...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]>

Author: dependabot[bot]

.github/workflows/lint.yml

@@ -9,6 +9,6 @@ jobs:
     env:
       SHELLCHECK_OPTS: -x
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master

.github/workflows/trigger-deployments.yml

@@ -14,7 +14,7 @@ jobs:
     outputs:
       on_main: ${{ steps.contains_tag.outputs.retval }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           fetch-tags: true
@@ -33,7 +33,7 @@ jobs:
       KNOWN_HOSTS: ${{ secrets.KNOWN_HOSTS }}
     steps:
     - name: Check out repository code to access trigger_deployment.sh
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - run: ./trigger_deployment.sh
     - uses: artiz/[email protected]
       with:
@@ -57,7 +57,7 @@ jobs:
       KNOWN_HOSTS: ${{ secrets.KNOWN_HOSTS }}
     steps:
     - name: Check out repository code to access trigger_deployment.sh
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - run: ./trigger_deployment.sh
     - uses: artiz/[email protected]
       with:

.github/workflows/update-service-image.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     environment: build
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         ssh-key: "${{ secrets.SSH_PUSH_DEPLOY_PRIVATE_KEY }}"
     - run: git config --global user.email "[email protected]"