trino: Flaky io.prestosql.server.security.oauth2.TestOAuth2WebUiAuthenticationFilter: testExpiredAccessToken, testSuccessfulFlow

java.lang.NullPointerException
	at io.prestosql.server.security.oauth2.TestOAuth2WebUiAuthenticationFilter.lambda$testExpiredAccessToken$1(TestOAuth2WebUiAuthenticationFilter.java:205)
	at io.prestosql.server.security.oauth2.TestOAuth2WebUiAuthenticationFilter.withSuccessfulAuthentication(TestOAuth2WebUiAuthenticationFilter.java:235)
	at io.prestosql.server.security.oauth2.TestOAuth2WebUiAuthenticationFilter.testExpiredAccessToken(TestOAuth2WebUiAuthenticationFilter.java:204)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:104)
	at org.testng.internal.Invoker.invokeMethod(Invoker.java:645)
	at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:851)
	at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1177)
	at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)
	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:834)