Specification SHA2_256: remove lax flag for tests
Specification SHA2_256: remove lax flag for tests

mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star,mitls/hacl-star