chore: Pin github actions. #2567

Job	Run time
build-test-client-windows	16m 34s
contract-tests	3m 15s
build-test-client-mac	8m 0s
contract-tests-curl	2m 41s
build-test	5m 20s
build-test-client-mac-curl	9m 40s
build-test-client-windows-curl	18m 2s
build-test-curl	5m 36s
	1h 9m 8s

Provide feedback