gradle: Close URLClassLoader to prevent leaking file locks

injector-plugin/build.gradle

@@ -39,7 +39,7 @@ compileJava.doLast() {
         into "$buildDir"
     }
     def path = sourceSets.main.runtimeClasspath
-    def loader = new URLClassLoader(path.collect { f -> f.toURL() } as URL[])
+    def loader = new URLClassLoader(path.collect { f -> f.toURI().toURL() } as URL[])
     def inject = loader.loadClass('net.runelite.injector.Injector')
     String[] jarPaths = [
             deobfuscatedJar.toString(),
@@ -47,6 +47,7 @@ compileJava.doLast() {
             injectedClassesPath.toString()
     ]
     inject.main(jarPaths)
+    loader.close()
 }
 
 test {