Temporary - Set build Groovy to build groovy to 3_0_21 until apache/groovy#2103 is merged

Author: codeconsole

.github/workflows/groovy-joint-workflow.yml

@@ -49,9 +49,9 @@ jobs:
             ~/groovy
             ~/.m2/repository
           key: cache-local-groovy-maven-${{ github.sha }}
-      - name: Checkout Groovy 3_0_X (Grails 5 and later)
+      - name: Checkout Groovy 3_0_21 (Grails 5 and later)
         if: startsWith(github.ref, 'refs/heads/6.') || startsWith(github.base_ref, '6.') || startsWith(github.ref, 'refs/heads/5.') || startsWith(github.base_ref, '5.')
-        run: cd .. && git clone --depth 1 https://github.com/apache/groovy.git -b GROOVY_3_0_X --single-branch
+        run: cd .. && git clone --depth 1 https://github.com/apache/groovy.git -b GROOVY_3_0_21 --single-branch
       - name: Set CI_GROOVY_VERSION for Grails
         id: groovy-version
         run: |

build.gradle

@@ -2,6 +2,7 @@ buildscript {
     repositories {
         maven { url "https://plugins.gradle.org/m2/" }
         maven { url "https://repo.grails.org/grails/core" }
+        maven { url 'https://groovy.jfrog.io/artifactory/libs-release-local/' }
     }
     dependencies {
         classpath "commons-io:commons-io:2.15.1"