Update actions/first-interaction action to v2

Author: renovate[bot]

.github/workflows/greetings.yml

@@ -6,7 +6,7 @@ jobs:
   greeting:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/first-interaction@v1
+    - uses: actions/first-interaction@v2
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         issue-message: 'Message that will be displayed on users'' first issue'