chore: pin GitHub Actions to commit SHA #1083

Job	Run time
build	19s
integration-tests (integration-dind-ssl)	4m 22s
integration-tests (integration-dind-ssh)	1m 29s
integration-tests (integration-dind)	4m 7s
unit-tests (3.12)	21s
lint	10s
unit-tests (3.10)	20s
unit-tests (3.11)	21s
unit-tests (3.9)	27s
unit-tests (3.8)	26s
	12m 22s

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