Update gradle Docker tag to v7

8 jobs for renovate/gradle-7.x in 27 minutes and 4 seconds (queued for 1 second)
latest
Name Stage Failure
failed
build-xnat-openid-auth-plugin Build Dependencies
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BUILD FAILED in 2m 18s
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1

failed
build-snet-asclepios-plugin Build Dependencies

You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.

See https://docs.gradle.org/7.4.1/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 1m 18s
1 actionable task: 1 executed
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1