Bump com.github.spotbugs from 6.4.2 to 6.4.8 in /service

Bumps com.github.spotbugs from 6.4.2 to 6.4.8.

---
updated-dependencies:
- dependency-name: com.github.spotbugs
  dependency-version: 6.4.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

service/build.gradle

@@ -3,7 +3,7 @@ plugins {
 	id 'io.spring.dependency-management' version '1.1.7'
 	id 'java'
 	id "checkstyle"
-	id "com.github.spotbugs" version "6.4.2"
+	id "com.github.spotbugs" version "6.4.8"
 	id "io.freefair.lombok" version "9.1.0"
 	id 'jacoco'
 	id 'org.sonarqube' version '6.3.1.5724'