Add support for `Cargo.lock` version `4` #51

Job	Run time
Run Tests (test_phoenix_v1, stable)	4m 12s
Run Tests (test_phoenix_v1, nightly)	34s
Run Tests (test_squads_v3, stable)	3m 8s
Run Tests (test_squads_v3, nightly)	35s
Run Tests (test_drift_v2, stable)	7m 48s
Run Tests (test_drift_v2, nightly)	36s
Run Tests (test_marginfi_v2, stable)	6m 13s
Run Tests (test_marginfi_v2, nightly)	36s
Run Tests (test_local_example, stable)	3m 13s
Run Tests (test_local_example, nightly)	37s
Run Tests (test_verify_from_image, stable)	2m 36s
Run Tests (test_verify_from_image, nightly)	36s
Run Tests (test_games_preset, stable)	4m 21s
Run Tests (test_games_preset, nightly)	37s
Run Tests (test_agave_2_1, stable)	2m 27s
Run Tests (test_agave_2_1, nightly)	34s
	38m 43s

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