metro-policy fails to build with Java 21

[vpa1977]

When building metro-policy with Java 21 the following test assertion occurs during build:

ERROR] Tests run: 16, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.004 s <<< FAILURE! - in com.sun.xml.ws.policy.privateutil.PolicyUtilsTest
[ERROR] com.sun.xml.ws.policy.privateutil.PolicyUtilsTest.testGetCallerMethodName  Time elapsed: 0.002 s  <<< FAILURE!
junit.framework.ComparisonFailure: expected:<[testGetCallerMethodNam]e> but was:<[invok]e>
	at junit.framework.Assert.assertEquals(Assert.java:100)
	at junit.framework.Assert.assertEquals(Assert.java:107)
	at junit.framework.TestCase.assertEquals(TestCase.java:260)
	at com.sun.xml.ws.policy.privateutil.PolicyUtilsTest$1TestCall.testCall(PolicyUtilsTest.java:81)
	at com.sun.xml.ws.policy.privateutil.PolicyUtilsTest.testGetCallerMethodName(PolicyUtilsTest.java:86)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at junit.framework.TestCase.runTest(TestCase.java:177)
	at junit.framework.TestCase.runBare(TestCase.java:142)
	at junit.framework.TestResult$1.protect(TestResult.java:122)
	at junit.framework.TestResult.runProtected(TestResult.java:142)
	at junit.framework.TestResult.run(TestResult.java:125)
	at junit.framework.TestCase.run(TestCase.java:130)
	at junit.framework.TestSuite.runTest(TestSuite.java:241)
	at junit.framework.TestSuite.run(TestSuite.java:236)
	at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:90)
	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:316)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:240)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:214)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:155)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:385)
	at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:162)
	at org.apache.maven.surefire.booter.ForkedBooter.run(ForkedBooter.java:507)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:495)