Pin GradleUtils to 2.2.0

This at least makes MappingVerifier 2.0 buildable. MappingVerifier 2.1
will be updating the entire workspace and be moved off of TeamCity and
into GitHub Actions.

Author: Jonathing

build.gradle

@@ -3,7 +3,7 @@ plugins {
     id 'eclipse'
     id 'maven-publish'
     id 'org.cadixdev.licenser' version '0.6.1'
-    id 'net.minecraftforge.gradleutils' version '2.+'
+    id 'net.minecraftforge.gradleutils' version '2.2.0'
     id 'com.github.johnrengelman.shadow' version '2.0.4'
 }