Bump ikalnytskyi/action-setup-postgres from 5 to 6

Bumps [ikalnytskyi/action-setup-postgres](https://github.com/ikalnytskyi/action-setup-postgres) from 5 to 6.
- [Release notes](https://github.com/ikalnytskyi/action-setup-postgres/releases)
- [Commits](ikalnytskyi/action-setup-postgres@v5...v6)

---
updated-dependencies:
- dependency-name: ikalnytskyi/action-setup-postgres
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/build.yml

@@ -28,7 +28,7 @@ jobs:
 
       - name: Setup PostgreSQL DB
         if: matrix.os != 'macos-12'  # macOS is too slow for tests in GitHub Actions
-        uses: ikalnytskyi/action-setup-postgres@v5
+        uses: ikalnytskyi/action-setup-postgres@v6
         id: postgres
         with:
           username: fdp