update typescript #868

Job	Run time
yjs-lib-test	1m 2s
benchmark-build	1m 6s
lib-site-build	1m 34s
lib-test (tsc - mobx6)	1m 24s
lib-test (tsc - mobx5)	1m 15s
lib-test (tsc - mobx4)	1m 15s
lib-test (tsc-experimental-decorators - mobx6)	1m 19s
lib-test (tsc-experimental-decorators - mobx5)	1m 19s
lib-test (tsc-experimental-decorators - mobx4)	1m 15s
lib-test (babel - mobx6)	1m 3s
lib-test (babel - mobx5)	59s
lib-test (babel - mobx4)	1m 1s
lib-test (swc - mobx6)	1m 1s
lib-test (swc - mobx5)	1m 1s
lib-test (swc - mobx4)	1m 2s
	17m 36s

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