Bump Kotlin to 2.1.21

[geoand]

Replaces #47836, #47839 and #47831

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit a645666.

Failing Jobs

Status	Name	Step	Failures	Logs	Raw logs	Build scan
✖	Native Tests - Data2	Build	Failures	Logs	Raw logs	🔍

Full information is available in the Build summary check run.
You can consult the Develocity build scans.

Failures

⚙️ Native Tests - Data2 #

- Failing: integration-tests/jpa 

📦 integration-tests/jpa

✖ io.quarkus.it.jpa.configurationless.JPALoadScriptTestInGraalITCase.testImportExecuted - History - More details - Source on GitHub

java.lang.AssertionError: 
1 expectation failed.
Response body doesn't match expectation.
Expected: a string containing "jpa=OK"
  Actual: {jpa=Boooo}

	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)

[geoand]

CI failure is unrelated to the PR