build(deps): bump com.github.spotbugs.snom:spotbugs-gradle-plugin

Bumps [com.github.spotbugs.snom:spotbugs-gradle-plugin](https://github.com/spotbugs/spotbugs-gradle-plugin) from 6.0.20 to 6.0.21.
- [Release notes](https://github.com/spotbugs/spotbugs-gradle-plugin/releases)
- [Commits](spotbugs/spotbugs-gradle-plugin@6.0.20...6.0.21)

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

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

build.gradle

@@ -87,7 +87,7 @@ buildscript {
         /* 添加插件依赖路径（通过jar方式） */
 
         //https://plugins.gradle.org/m2/com/github/spotbugs/snom/spotbugs-gradle-plugin/
-        classpath "com.github.spotbugs.snom:spotbugs-gradle-plugin:6.0.20"
+        classpath "com.github.spotbugs.snom:spotbugs-gradle-plugin:6.0.21"
 
         //https://github.com/spring-io/spring-javaformat/
         classpath "io.spring.javaformat:spring-javaformat-gradle-plugin:0.0.43"