Bump actions/first-interaction from 1 to 2

Bumps [actions/first-interaction](https://github.com/actions/first-interaction) from 1 to 2.
- [Release notes](https://github.com/actions/first-interaction/releases)
- [Commits](actions/first-interaction@v1...v2)

---
updated-dependencies:
- dependency-name: actions/first-interaction
  dependency-version: '2'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/first-timer.yml

@@ -8,7 +8,7 @@ jobs:
   nag_first_timer:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/first-interaction@v1
+    - uses: actions/first-interaction@v2
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         pr-message: 'This seems to be your first PR. You will need a positive review in order for tests to start.'