upgrade github actions

Author: sachin-sandhu

.github/workflows/create_staging_branch.yaml

@@ -16,7 +16,7 @@ jobs:
   ensure-base-is-staging:
     runs-on: ubuntu-latest
     steps:
-     - uses: actions/checkout@v2
+     - uses: actions/checkout@v4
      - name: ensure base is staging
        env:
          PR_AUTHOR: ${{ github.event.pull_request.user.login }}

.github/workflows/delete_staging_and_head_branches.yaml

@@ -16,7 +16,7 @@ jobs:
     if: ${{ !github.event.pull_request.head.repo.fork }}
     runs-on: ubuntu-latest
     steps:
-     - uses: actions/checkout@v2
+     - uses: actions/checkout@v4
      - name: Delete staging and head branches
        env:
          STAGING_BRANCH: ${{ github.event.pull_request.base.ref }}