build(deps): bump com.github.spotbugs from 6.0.14 to 6.0.15

Bumps com.github.spotbugs from 6.0.14 to 6.0.15.

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

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle

@@ -1,7 +1,7 @@
 plugins {
   // Manage optional dependencies in maven pom.
   id "nebula.optional-base" version "7.0.0" apply false
-  id "com.github.spotbugs" version "6.0.14" apply false
+  id "com.github.spotbugs" version "6.0.15" apply false
   id "org.sonarqube" version "4.4.1.3373"
   id "org.owasp.dependencycheck" version "9.0.10" apply false
   id "io.freefair.lombok" version "8.6" apply false