Fix cargo audit issue on criterion

[ysaito1001]

Motivation and Context

Fixes #1044

Description

This PR updates criterion from 0.3.6 to 0.4.0 to address RUSTSEC-2021-0127 where criterion 0.3.6 depends upon an unmaintained crate serde_cbor.

Testing

Ran cargo audit in aws/sdk/integration-tests.

Before the fix:

$ cargo audit
    Fetching advisory database from `https://github.com/RustSec/advisory-db.git`
      Loaded 464 security advisories
    Updating crates.io index
    Scanning Cargo.lock for vulnerabilities (265 crate dependencies)
Crate:     serde_cbor
Version:   0.11.2
Warning:   unmaintained
Title:     serde_cbor is unmaintained
Date:      2021-08-15
ID:        RUSTSEC-2021-0127
URL:       https://rustsec.org/advisories/RUSTSEC-2021-0127
Dependency tree:
serde_cbor 0.11.2
└── criterion 0.3.6
    └── dynamo-tests 0.1.0

After the fix (no vulnerabilities reported):

$ cargo audit
    Fetching advisory database from `https://github.com/RustSec/advisory-db.git`
      Loaded 464 security advisories
    Updating crates.io index
    Scanning Cargo.lock for vulnerabilities (265 crate dependencies)

Checklist

• I have updated CHANGELOG.next.toml if I made changes to the smithy-rs codegen or runtime crates
• I have updated CHANGELOG.next.toml if I made changes to the AWS SDK, generated SDK code, or SDK runtime crates

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[github-actions]

A new generated diff is ready to view.

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

A new doc preview is ready to view.

[github-actions]

A new generated diff is ready to view.

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

A new doc preview is ready to view.