Bump com.github.spotbugs in the development-dependencies group (#76)

Bumps the development-dependencies group with 1 update: com.github.spotbugs.


Updates `com.github.spotbugs` from 6.0.20 to 6.0.21

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

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

build.gradle

@@ -7,7 +7,7 @@ plugins {
 	id 'base'
 	id 'io.spring.dependency-management' version '1.1.6'
 	id 'io.spring.javaformat' version "${javaFormatVersion}"
-	id 'com.github.spotbugs' version '6.0.20'
+	id 'com.github.spotbugs' version '6.0.21'
 	id 'org.ajoberstar.grgit' version '5.2.2'
 }