Update Pull Request Checks to match the (opensearch-project#13688)

Author: prudhvigodithi

.github/workflows/dependabot_pr.yml

@@ -7,7 +7,7 @@ jobs:
     permissions:
       pull-requests: write
       contents: write
-    if: ${{ github.actor == 'dependabot[bot]' }}
+    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]' }}
     steps:
       - name: GitHub App token
         id: github_app_token

.github/workflows/pull-request-checks.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: peternied/check-pull-request-description-checklist@v1.1
-        if: github.actor != 'dependabot[bot]'
+        if: github.event.pull_request.user.login != 'dependabot[bot]'
         with:
           checklist-items: |
             New functionality includes testing.