Use latest version of checkstyle to avoid Guava CVE

Signed-off-by: Daniel Widdis <[email protected]>

build.gradle

@@ -42,14 +42,23 @@ buildscript {
     }
 }
 
+plugins {
+    id 'eclipse'
+    id 'idea'
+    id 'com.diffplug.spotless'
+    id 'checkstyle'
+}
+
+apply from: rootProject.file('formatter/formatting.gradle')
+
+checkstyle {
+    toolVersion = "latest.release"
+}
+
 allprojects {
     apply plugin: 'java'
-    apply plugin: 'idea'
     apply plugin: 'maven-publish'
-    apply plugin: 'eclipse'
     apply plugin: 'jacoco'
-    apply plugin: 'com.diffplug.spotless'
-    apply plugin: 'checkstyle'
 
     repositories {
         mavenLocal()
@@ -223,7 +232,6 @@ subprojects {
     }
 }
 
-apply from: rootProject.file('formatter/formatting.gradle')
 
 // Task to update version
 task updateVersion {