Bump com.github.spotbugs from 6.0.15 to 6.4.8 (#99)

Bumps com.github.spotbugs from 6.0.15 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-minor
...

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

Author: dependabot[bot]

build.gradle

@@ -3,7 +3,7 @@ plugins {
     id 'maven-publish'
     id 'signing'
     id 'jacoco'
-    id 'com.github.spotbugs' version '6.0.15'
+    id 'com.github.spotbugs' version '6.4.8'
     id 'pmd'
     id 'checkstyle'
     id 'info.solidsoft.pitest' version '1.19.0-rc.3'