Delete nonprintable characters from aws-smithy-checksums test

[dtolnay]

Motivation and Context

The nonprintable characters in this source file make tools misidentify it as a binary file, rather than source code.

Description

Before:

$ file rust-runtime/aws-smithy-checksums/src/http.rs
rust-runtime/aws-smithy-checksums/src/http.rs: data

After:

$ file rust-runtime/aws-smithy-checksums/src/http.rs
rust-runtime/aws-smithy-checksums/src/http.rs: ASCII text

---

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[dtolnay]

Additionally, I recommend finding a way to re-review all previous changes to this file, as it's likely they went unreviewed in the first place.

• https://github.com/smithy-lang/smithy-rs/pull/1561/files#diff-6982e78269354e1051152534be8202ee5b606d495c5d7555dff307962ec27dfa
• https://github.com/smithy-lang/smithy-rs/pull/1938/files#diff-6982e78269354e1051152534be8202ee5b606d495c5d7555dff307962ec27dfa
• https://github.com/smithy-lang/smithy-rs/pull/3059/files#diff-6982e78269354e1051152534be8202ee5b606d495c5d7555dff307962ec27dfa

[dtolnay]

# Auditing runtime crate version numbers...
2024-08-01T19:23:27.698077Z  INFO runtime_versioner::command::audit: 'aws-config' changed and was version bumped from 1.5.4 to 1.5.5
2024-08-01T19:23:27.730127Z  INFO runtime_versioner::command::audit: 'aws-smithy-cbor' is a new crate (or wasn't independently versioned before) and will publish at 0.60.7
2024-08-01T19:23:27.755161Z  INFO runtime_versioner::command::audit: 'aws-smithy-http-server' changed and was version bumped from 0.63.1 to 0.63.2
2024-08-01T19:23:27.769870Z  INFO runtime_versioner::command::audit: 'aws-smithy-protocol-test' changed and was version bumped from 0.60.8 to 0.62.0
aws-smithy-checksums changed since release-2024-07-16 and requires a version bump
Error: there are audit failures in the runtime crates

[dtolnay]

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[ysaito1001]

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[dtolnay]

Rebased to resolve conflict with #3781 in aws/rust-runtime/Cargo.lock.

[github-actions]

A new generated diff is ready to view.

• AWS SDK (ignoring whitespace)
• No codegen difference in the Client Test
• 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.