Update pretty_assertions (#2332)

aws/rust-runtime/aws-sigv4/Cargo.toml

rust-runtime/aws-smithy-checksums/Cargo.toml

rust-runtime/aws-smithy-http/Cargo.toml

rust-runtime/aws-smithy-protocol-test/Cargo.toml

tools/ci-build/changelogger/Cargo.toml

tools/ci-build/crate-hasher/Cargo.toml

tools/ci-build/publisher/Cargo.toml

tools/ci-build/sdk-versioner/Cargo.toml

tools/ci-cdk/canary-runner/Cargo.toml