Bump com.github.spotbugs from 6.0.19 to 6.0.20 in /service (#824)

Bumps com.github.spotbugs from 6.0.19 to 6.0.20.

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

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

service/build.gradle

@@ -3,7 +3,7 @@ plugins {
 	id 'io.spring.dependency-management' version '1.1.6'
 	id 'java'
 	id "checkstyle"
-	id "com.github.spotbugs" version "6.0.19"
+	id "com.github.spotbugs" version "6.0.20"
 	id "io.freefair.lombok" version "8.6"
 	id 'jacoco'
 }