Update groovy monorepo

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.apache.groovy:groovy (source)	4.0.18 -> 4.0.19
org.codehaus.groovy:groovy (source)	3.0.20 -> 3.0.21

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[szpak]

@leonard84

        public Alpha next() {
            java.lang.Integer ordinal = this.ordinal() + 1

vs

    |            public Alpha next() {
    |                java.lang.Object ordinal = this.ordinal().next()

in a snapshot in 4.0.19.

https://github.com/spockframework/spock/actions/runs/8114534680/job/22180405992?pr=1901#step:4:116

[leonard84]

Looks like the snapshots have to be updated as something changed in the Groovy code generation.

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