Fix Linter error

Author: VimukthiPerera

.github/workflows/linter.yml

@@ -18,14 +18,11 @@ jobs:
       - name: Checkout Code
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
-          ref: ${{ github.head_ref }}
+          # Check out the head of the PR specifically
+          ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
           persist-credentials: false
 
-      - name: Set lint SHA from checked-out HEAD
-        id: set_lint_sha
-        run: echo "sha=$(git rev-parse HEAD)" >> "$GITHUB_OUTPUT"
-
       - name: Fetch base branch for diff
         run: git fetch --no-tags --prune origin "+refs/heads/${{ github.event.pull_request.base.ref }}:refs/remotes/origin/${{ github.event.pull_request.base.ref }}"
 
@@ -34,5 +31,5 @@ jobs:
         env:
           VALIDATE_ALL_CODEBASE: false
           DEFAULT_BRANCH: ${{ github.event.pull_request.base.ref }}
-          GITHUB_HEAD_REF: ${{ github.head_ref }}
+          GITHUB_SHA: ${{ github.event.pull_request.head.sha }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}