chore: Pin github actions. #2575

Job	Run time
contract-tests	2m 49s
build-test-client-windows	14m 13s
build-test-client-windows-curl	15m 34s
contract-tests-curl	3m 7s
build-test	5m 51s
build-test-client-mac-curl	8m 35s
build-test-client-mac	8m 40s
build-test-curl	5m 44s
	1h 4m 33s

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