chore(deps): update pretty_assertions requirement from 0.6.1 to 0.7.1

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>

Author: dependabot[bot]

derive/Cargo.toml

@@ -23,5 +23,5 @@ default = ["std"]
 std = []
 
 [dev-dependencies]
-pretty_assertions = "0.6.1"
+pretty_assertions = "0.7.1"
 multihash = { path = "..", default-features = false }