move to crypto/sha256 instead of sha256-simd

[harshavardhana]

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under the terms of the Apache 2 license.
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contributions to the project maintainers under the Apache 2 license.

Description

move to crypto/sha256 instead of sha256-simd

Motivation and Context

go1.21 has all the necessary optimizations now

How to test this PR?

CI/CD should do it

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here