Use more SynchronizedItemReader in tests
#4452
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The test
AsyncTaskletStepTests::testStepExecutionUpdatesis flaky at the moment. At least on my machine, it fails rather reliably a handful of times with@RepeatedTest(1000).This PR fixes the test by using a
SynchronizedItemReader. It also replaces the fix from #4291 withSynchronizedItemReader, which wasn't available previously. Furthermore, it polishes the two tests a bit with more recent Java features.