Bump nick-fields/retry from 3 to 4

Bumps [nick-fields/retry](https://github.com/nick-fields/retry) from 3 to 4.
- [Release notes](https://github.com/nick-fields/retry/releases)
- [Commits](nick-fields/retry@v3...v4)

---
updated-dependencies:
- dependency-name: nick-fields/retry
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/java8-maven.yml

@@ -43,7 +43,7 @@ jobs:
 
     steps:
       - name: Merge PR
-        uses: nick-fields/retry@v3
+        uses: nick-fields/retry@v4
         with:
           command: gh pr merge --auto --rebase "$PR_URL"
           max_attempts: 3