Bump SpotBugs Gradle plugin from 6.3.0 to 6.4.1 with Kotlin compatibility fix

Co-authored-by: trask <218610+trask@users.noreply.github.com>

Author: Copilot

buildSrc/build.gradle.kts

@@ -5,6 +5,12 @@ plugins {
   id("com.diffplug.spotless") version "7.2.1"
 }
 
+tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
+  compilerOptions {
+    freeCompilerArgs.addAll("-Xskip-metadata-version-check")
+  }
+}
+
 spotless {
   java {
     googleJavaFormat()
@@ -31,7 +37,7 @@ dependencies {
 
   // When updating, update above in plugins too
   implementation("com.diffplug.spotless:spotless-plugin-gradle:7.2.1")
-  implementation("com.github.spotbugs.snom:spotbugs-gradle-plugin:6.3.0")
+  implementation("com.github.spotbugs.snom:spotbugs-gradle-plugin:6.4.1")
   implementation("com.gradleup.shadow:shadow-gradle-plugin:8.3.9")
 
   implementation("org.owasp:dependency-check-gradle:12.1.3")