fix(ci): align greetings workflow inputs with first-interaction@v3 (#3365)

* fix(ci): align greetings workflow inputs with first-interaction@v3

The v3 action renamed inputs from kebab-case to snake_case.
Rename repo-token/issue-message/pr-message to the new names
so the workflow stops failing on every new issue and PR

* ci: pin first-interaction action to v3.1.0 commit SHA

Author: RecreationalMath

.github/workflows/greetings.yml

@@ -7,8 +7,8 @@ jobs:
   greeting:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/first-interaction@v3
+      - uses: actions/first-interaction@1c4688942c71f71d4f5502a26ea67c331730fa4d # v3.1.0
         with:
-          repo-token: ${{ secrets.GITHUB_TOKEN }}
-          issue-message: "Hi! Thanks for your contribution! Great first issue!"
-          pr-message: "Hey thanks for the input! Please give us a bit of time to review it!"
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          issue_message: "Hi! Thanks for your contribution! Great first issue!"
+          pr_message: "Hey thanks for the input! Please give us a bit of time to review it!"