Bump com.github.spotbugs from 6.0.14 to 6.0.15 (#66)

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
...

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build.gradle.kts

@@ -7,7 +7,7 @@ plugins {
     id("maven-publish")
     id("checkstyle")
     id("pmd")
-    id("com.github.spotbugs") version "6.0.14"
+    id("com.github.spotbugs") version "6.0.15"
     id("net.ltgt.errorprone") version "3.1.0"
     id("com.github.ben-manes.versions") version "0.51.0"
 }