Bump temporal SDK to 1.21.0 (#269) #1037

Job	Run time
build-lint-test (3.14, macos-intel)	16m 3s
build-lint-test (3.10, macos-intel)	9m 58s
build-lint-test (3.10, macos-arm)	10m 4s
build-lint-test (3.14, ubuntu-latest)	15m 25s
build-lint-test (3.10, windows-latest)	6m 31s
build-lint-test (3.14, windows-latest)	22m 4s
build-lint-test (3.10, ubuntu-latest)	5m 46s
build-lint-test (3.14, macos-arm)	11m 28s
	1h 37m 19s

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