Upgrade Groovy to 5.1.1

[sbglasius]

Summary

• Bumps groovy.version from 5.1.0 to 5.1.1 in dependencies.gradle (both the primary BOM pin and the duplicate literal used by grails-micronaut-bom/grails-hibernate5-micronaut-bom)
• Fixes stale "5.0.x" Groovy version references in AGENTS.md/CLAUDE.md and the groovy-developer, gradle-developer, and grails-developer skill docs, which had drifted from the prior 5.1.0 bump

Groovy 5.1.1 is a maintenance release on the 5.1.x line, fixing:

• GROOVY-12142: Metaspace leak on parallel Tomcat deployments
• GROOVY-12166: static type checking regression causing ClassCastException on instanceof-narrowed fields
• GROOVY-12257: Groovy 4/5 @Immutable bytecode incompatibility
• GROOVY-12286: bumps its own Jackson dependency to 2.22.2 (already independently pinned in this repo's BOM, so no further change needed here)

See the changelog.

Test plan

• ./gradlew clean build -PskipTests succeeds
• ./gradlew validateDependencyVersions — one pre-existing, unrelated failure (org.graalvm.sdk:nativeimage version drift in the micronaut example projects) confirmed to also occur on unmodified 5.1.0, so not introduced by this change
• Full test suite / style / violation checks left to CI per project convention

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.8278%. Comparing base (5670a65) to head (e553877).
⚠️ Report is 6 commits behind head on 8.0.x.

Additional details and impacted files

@@                Coverage Diff                 @@
##                8.0.x     #16235        +/-   ##
==================================================
+ Coverage     54.8238%   54.8278%   +0.0040%     
- Complexity      20521      20525         +4     
==================================================
  Files            2104       2104                
  Lines          101102     101102                
  Branches        17932      17932                
==================================================
+ Hits            55428      55432         +4     
+ Misses          37787      37784         -3     
+ Partials         7887       7886         -1     

see 3 files with indirect coverage changes

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[sbglasius]

I cannot merge this as long as there is an OutOfMemory Exception being thrown. On slack @paulk-asert mentioned:

We have had another user report increased memory requirements for 5.1.1 over 5.1.0, the suggestion for them while we try to find a better fix is to bump up their mem spec to -Xmx512m.

You could also potentially test against:
apache/groovy#2840

And @jamesfredley has created a potential fix for it here #16167

So perhaps 5.1.1 is not suitable as it is?

@matrei / @jdaugherty since you approved this, what are your thoughts?

[matrei]

since you approved this, what are your thoughts?

@sbglasius I think we hold off 5.1.1 until there is a fix for the memory problem.

[sbglasius]

I have changed this PR to draft for the time being, until the issue with Groovy 5.1.1 is resolved.

[testlens-app]

🚨 TestLens detected 1 failed test 🚨

Here is what you can do:

1. Inspect the test failures carefully.
2. If you are convinced that some of the tests are flaky, you can mute them below.
3. Finally, trigger a rerun by checking the rerun checkbox.

Test Summary

CI / Functional Tests (Java 21, indy=true) > :grails-test-examples-scaffolding:integrationTest

Test	Runs	Flakiness
UserControllerSpec > User list	❌	4% 🟡

🏷️ Commit: e553877
▶️ Tests: 67705 executed
⚪️ Checks: 89/89 completed

Test Failures

UserControllerSpec > User list (:grails-test-examples-scaffolding:integrationTest in CI / Functional Tests (Java 21, indy=true))

geb.waiting.WaitTimeoutException: condition did not pass in 30 seconds (failed with exception)
	at geb.waiting.Wait.waitFor(Wait.groovy:128)
	at geb.waiting.DefaultWaitingSupport.doWaitFor(DefaultWaitingSupport.groovy:55)
	at geb.waiting.DefaultWaitingSupport.waitFor(DefaultWaitingSupport.groovy:41)
	at geb.Page.waitFor(Page.groovy:120)
	at com.example.pages.LoginPage.login(LoginPage.groovy:39)
	at com.example.UserControllerSpec.User list(UserControllerSpec.groovy:48)
Caused by: Assertion failed: 

title != pageTitle && $('input', name: 'username').empty
|     |  |         |
|     |  |         false
|     |  'Please sign in'
|     false
'Please sign in'

	at com.example.pages.LoginPage.login_closure1(LoginPage.groovy:39)
	at com.example.pages.LoginPage.login_closure1(LoginPage.groovy)
	at geb.waiting.Wait.waitFor(Wait.groovy:117)
	... 5 more

Rerun Controls

Select tests to mute in this pull request:

• UserControllerSpec > User list

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