Bump com.github.spotbugs from 4.7.9 to 6.0.6 in /gpc-api-facade (#406)

Bumps com.github.spotbugs from 4.7.9 to 6.0.6.

---
updated-dependencies:
- dependency-name: com.github.spotbugs
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

gpc-api-facade/build.gradle

@@ -3,7 +3,7 @@ plugins {
     id 'io.spring.dependency-management' version '1.0.11.RELEASE'
     id 'java'
     id 'checkstyle'
-    id 'com.github.spotbugs' version '4.7.9'
+    id 'com.github.spotbugs' version '6.0.6'
     id 'io.freefair.lombok' version '6.2.0'
 }