[ci] [R-package] re-enable r-sanitizers jobs (fixes #6367) (#6374)

Author: jameslamb

Diff for: .github/workflows/r_package.yml

@@ -315,7 +315,7 @@ jobs:
   all-r-package-jobs-successful:
     if: always()
     runs-on: ubuntu-latest
-    needs: [test, test-r-debian-clang]
+    needs: [test, test-r-sanitizers, test-r-debian-clang]
     steps:
     - name: Note that all tests succeeded
       uses: re-actors/[email protected]