Fix `CursorId` and `Event::getServer()` deprecation in tests #2366

Job	Run time
PHPUnit tests (ubuntu-20.04, 7.4, 4.4, server)	4m 31s
PHPUnit tests (ubuntu-20.04, 8.0, 4.4, server)	4m 33s
PHPUnit tests (ubuntu-20.04, 8.1, 4.4, server)	4m 35s
PHPUnit tests (ubuntu-20.04, 8.2, 4.4, server)	4m 45s
PHPUnit tests (ubuntu-20.04, 8.3, 4.4, server)	4m 28s
PHPUnit tests (ubuntu-20.04, 8.4, 4.4, server)	4m 56s
PHPUnit tests (ubuntu-20.04, 8.0, 6.0, replica_set)	5m 50s
PHPUnit tests (ubuntu-20.04, 8.0, 6.0, sharded_cluster)	8m 26s
PHPUnit tests (ubuntu-20.04, 8.0, 5.0, server)	4m 5s
PHPUnit tests (ubuntu-20.04, 8.0, 4.4, replica_set)	5m 9s
PHPUnit tests (ubuntu-20.04, 8.0, 4.4, sharded_cluster)	8m 7s
	59m 25s

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