fix(deps): update groovy monorepo to v3.0.20

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.codehaus.groovy:groovy-test (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-jmx (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-sql (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-json (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-groovysh (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-swing (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-console (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-templates (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-xml (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-groovydoc (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-test-junit5 (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-cli-picocli (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy-ant (source)	3.0.11 -> 3.0.20
org.codehaus.groovy:groovy (source)	3.0.11 -> 3.0.20

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[puneetbehl]

@matrei Could you please take a look? It seems that 6.1.x is still incompatible with Grails 6.1?

[matrei]

@puneetbehl Merge #13371 and rebase this branch

It seems that the Groovy Joint Workflow is not actually resolving the Groovy Snapshot version when building Grails: https://ge.grails.org/s/jckk75vtpjvha/dependencies?toggled=W1syM10sWzIzLDFdXQ