Bump com.github.spotbugs.snom:spotbugs-gradle-plugin from 6.0.20 to 6.0.21 (#3857)

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

Author: dependabot[bot]

buildSrc/build.gradle.kts

@@ -28,7 +28,7 @@ dependencies {
 
   // When updating, update above in plugins too
   implementation("com.diffplug.spotless:spotless-plugin-gradle:6.25.0")
-  implementation("com.github.spotbugs.snom:spotbugs-gradle-plugin:6.0.20")
+  implementation("com.github.spotbugs.snom:spotbugs-gradle-plugin:6.0.21")
   implementation("com.github.johnrengelman:shadow:8.1.1")
   implementation("com.gradle.enterprise:com.gradle.enterprise.gradle.plugin:3.18")