Update contributing guide #5651

Job	Run time
check-protos	8m 48s
build-lint-test (3.14, ubuntu-latest)	19m 45s
build-lint-test (3.10, macos-arm)	10m 50s
test-latest-deps	10m 43s
build-lint-test (3.10, ubuntu-arm)	12m 10s
build-lint-test (3.10, ubuntu-latest)	16m 7s
cloud-test	2m 15s
build-lint-test (3.14, windows-latest)	21m 54s
build-lint-test (3.10, windows-latest)	19m 12s
build-lint-test (3.14, ubuntu-arm)	12m 47s
features-tests / test	9m 10s
build-lint-test (3.14, macos-arm)	13m 9s
	2h 36m 50s

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