chore: Bump org.openrewrite.rewrite

Bumps the gradle-version-updates group in /backend with 1 update: org.openrewrite.rewrite.


Updates `org.openrewrite.rewrite` from 6.27.2 to 6.28.0

---
updated-dependencies:
- dependency-name: org.openrewrite.rewrite
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: gradle-version-updates
...

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

backend/build.gradle

@@ -9,7 +9,7 @@ plugins {
     id "org.owasp.dependencycheck" version "8.4.3"
     id "com.diffplug.spotless" version "6.25.0"
     id "info.solidsoft.pitest" version "1.15.0"
-    id "org.openrewrite.rewrite" version "6.27.2"
+    id "org.openrewrite.rewrite" version "6.28.0"
 }
 
 spotless {