Bump plbstl/first-contribution from 3 to 4

Bumps [plbstl/first-contribution](https://github.com/plbstl/first-contribution) from 3 to 4.
- [Release notes](https://github.com/plbstl/first-contribution/releases)
- [Commits](https://github.com/plbstl/first-contribution/compare/v3...v4)

---
updated-dependencies:
- dependency-name: plbstl/first-contribution
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/issue-welcome-first-time.yml

@@ -11,7 +11,7 @@ jobs:
       issues: write
       pull-requests: write
     steps:
-      - uses: plbstl/first-contribution@v3
+      - uses: plbstl/first-contribution@v4
         with:
           labels: "Good first issue"
           issue-opened-msg: |