fix: phpunit segfault (#8)

phpunit.xml

src/ObservableTaskTable.php

src/ObservableTaskTableSlotStatusUpdateIterator.php

src/ObservableTaskTableSlotStatusUpdateIteratorTest.php

src/ObservableTaskTableTest.php

src/PHPUnitSwooleCoroutineExtension.php

src/PostfixBounceAnalyzerTest.php

src/SwooleTimeout.php

src/SwooleTimeoutScheduled.php

src/SwooleTimeoutScheduler.php

src/SwooleTimeoutTest.php

src/WebSocketConnection.php

...ocketRPCResponder/ObservableTasksTableUpdateResponder.php