Update pretty_assertions requirement from 0.6.1 to 0.7.1 (#8)

Updates the requirements on [pretty_assertions](https://github.com/colin-kiegel/rust-pretty-assertions) to permit the latest version.
- [Release notes](https://github.com/colin-kiegel/rust-pretty-assertions/releases)
- [Changelog](https://github.com/colin-kiegel/rust-pretty-assertions/blob/main/CHANGELOG.md)
- [Commits](rust-pretty-assertions/rust-pretty-assertions@v0.6.1...v0.7.1)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -12,7 +12,7 @@ futures = "0.3.5"
 
 [dev-dependencies]
 async-std = { version = "1.6.3", features = ["attributes"] }
-pretty_assertions = "0.6.1"
+pretty_assertions = "0.7.1"
 
 [dev-dependencies.cargo-husky]
 version = "1"