Fix typo in MaterializationClientV2/V3 #29

Job	Run time
Test against different Python versions (3.7, ubuntu-latest)	24s
Test against different Python versions (3.7, windows-latest)	1m 37s
Test against different Python versions (3.7, macos-latest)	1m 29s
Test against different Python versions (3.8, ubuntu-latest)	25s
Test against different Python versions (3.8, windows-latest)	1m 49s
Test against different Python versions (3.8, macos-latest)	53s
Test against different Python versions (3.9, ubuntu-latest)	29s
Test against different Python versions (3.9, windows-latest)	2m 28s
Test against different Python versions (3.9, macos-latest)	55s
Test against different Python versions (3.10, ubuntu-latest)	35s
Test against different Python versions (3.10, windows-latest)	1m 24s
Test against different Python versions (3.10, macos-latest)	1m 1s
Test against different Python versions (3.11, ubuntu-latest)	32s
Test against different Python versions (3.11, windows-latest)	2m 3s
Test against different Python versions (3.11, macos-latest)	41s
	16m 45s

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