Bump com.github.spotbugs from 5.2.5 to 6.0.9

Bumps com.github.spotbugs from 5.2.5 to 6.0.9.

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

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

Author: dependabot[bot]

build.gradle

@@ -24,7 +24,7 @@ plugins {
     id 'application'                                    // Creating application bundles
     id 'build-dashboard'                                // Produces a build report
     id 'checkstyle'                                     // Checkstyle for Java, configured further below
-    id "com.github.spotbugs" version '5.2.5'           // Spotbugs for Java
+    id "com.github.spotbugs" version '6.0.9'           // Spotbugs for Java
     id 'java'                                           // Core java / javac
     id 'maven-publish'                                  // Publishing to Maven Central
     id 'pmd'                                            // PMD for Java, configured further below