Update plugin com.github.spotbugs to v5.0.0-beta.6

Author: renovate-bot

build.gradle

@@ -8,7 +8,7 @@ plugins {
     id 'java'
     id 'pmd'
     id 'checkstyle'
-    id 'com.github.spotbugs' version '5.0.0-beta.1'
+    id 'com.github.spotbugs' version '5.0.0-beta.6'
     id 'org.springframework.boot' version '2.5.5'
     id 'io.spring.dependency-management' version '1.0.11.RELEASE'
     id 'org.jetbrains.gradle.plugin.idea-ext' version '1.1'