Update actions/first-interaction action to v2

Author: renovate[bot]

.github/workflows/greetings.yml

@@ -8,7 +8,7 @@ jobs:
     permissions:
       pull-requests: write
     steps:
-    - uses: actions/first-interaction@v1
+    - uses: actions/first-interaction@v2
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         pr-message: "Thanks a lot Sir/Ma'am for contributing on the repo ❤️"