Update spock to v2.3-groovy-4.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.spockframework:spock-spring (source)	2.1-groovy-3.0 -> 2.3-groovy-4.0
org.spockframework:spock-core (source)	2.1-groovy-3.0 -> 2.3-groovy-4.0

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