Removing the optimize_crc32_auto feature flag from the crc-fast

[landonxjames]

Motivation and Context

Removing the optimize_crc32_auto feature flag from the crc-fast dependency of the aws-smithy-checksums crate since it was causing build issues for some customers.

awslabs/aws-sdk-rust#1291

Description

Testing

Tested in an Amazon Linux 2023 Docker Container on an M1 Mac. Both cargo lambda build --arm64 and cargo lambda build --x86-64 succeeded with this change

Checklist

• For changes to the smithy-rs codegen or runtime crates, I have created a changelog entry Markdown file in the .changelog directory, specifying "client," "server," or both in the applies_to key.
• For changes to the AWS SDK, generated SDK code, or SDK runtime crates, I have created a changelog entry Markdown file in the .changelog directory, specifying "aws-sdk-rust" in the applies_to key.

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[github-actions]

A new generated diff is ready to view.

• AWS SDK (ignoring whitespace)
• Client Test (ignoring whitespace)
• No codegen difference in the Server Test
• No codegen difference in the Server Test Python
• No codegen difference in the Server Test Typescript

A new doc preview is ready to view.