fix(test): avoid racy reader vs writer contender in `test_rw_lock` #40

Job	Run time
Code Validation	54s
Windows - Sanity test using a single version of Python and ZK	5m 52s
Linux - Test Python 3.8, ZK 3.6.4	5m 22s
Linux - Test Python 3.8, ZK 3.7.2	5m 29s
Linux - Test Python 3.8, ZK 3.8.3	5m 22s
Linux - Test Python 3.8, ZK 3.9.1	5m 30s
Linux - Test Python 3.9, ZK 3.6.4	5m 24s
Linux - Test Python 3.9, ZK 3.7.2	5m 27s
Linux - Test Python 3.9, ZK 3.8.3	5m 33s
Linux - Test Python 3.9, ZK 3.9.1	5m 29s
Linux - Test Python 3.10, ZK 3.6.4	5m 24s
Linux - Test Python 3.10, ZK 3.7.2	5m 28s
Linux - Test Python 3.10, ZK 3.8.3	5m 28s
Linux - Test Python 3.10, ZK 3.9.1	5m 32s
Linux - Test Python 3.11, ZK 3.6.4	5m 42s
Linux - Test Python 3.11, ZK 3.7.2	5m 45s
Linux - Test Python 3.11, ZK 3.8.3	5m 51s
Linux - Test Python 3.11, ZK 3.9.1	5m 59s
Linux - Test Python 3.12, ZK 3.6.4	6m 16s
Linux - Test Python 3.12, ZK 3.7.2	6m 13s
Linux - Test Python 3.12, ZK 3.8.3	6m 28s
Linux - Test Python 3.12, ZK 3.9.1	6m 37s
Linux - Test Python pypy-3.10-v7.3.15, ZK 3.6.4	2m 14s
Linux - Test Python pypy-3.10-v7.3.15, ZK 3.7.2	2m 13s
Linux - Test Python pypy-3.10-v7.3.15, ZK 3.8.3	8m 29s
Linux - Test Python pypy-3.10-v7.3.15, ZK 3.9.1	8m 32s
	2h 22m 33s

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