ci: remove redundant actions/checkout steps from dev-infra workflows

Checking out the repo is not needed for these actions.

Author: alan-agius4

.github/workflows/dev-infra.yml

@@ -15,7 +15,6 @@ jobs:
     if: github.event_name == 'issues'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: ./github-actions/issue-labeling
         with:
           angular-robot-key: ${{ secrets.ANGULAR_ROBOT_PRIVATE_KEY }}
@@ -24,7 +23,6 @@ jobs:
     if: github.event_name == 'pull_request_target'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: ./github-actions/labeling/pull-request
         with:
           angular-robot-key: ${{ secrets.ANGULAR_ROBOT_PRIVATE_KEY }}
@@ -33,7 +31,6 @@ jobs:
     if: github.event_name == "pull_request_target"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       - uses: ./github-actions/post-approval-changes
         with:
           angular-robot-key: ${{ secrets.ANGULAR_ROBOT_PRIVATE_KEY }}