Bump pretty_assertions from 1.0.0 to 1.2.1 (#11360)

Bumps [pretty_assertions](https://github.com/colin-kiegel/rust-pretty-assertions) from 1.0.0 to 1.2.1.
- [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](https://github.com/colin-kiegel/rust-pretty-assertions/compare/v1.0.0...v1.2.1)

---
updated-dependencies:
- dependency-name: pretty_assertions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

substrate/primitives/state-machine/Cargo.toml

@@ -32,7 +32,7 @@ sp-trie = { version = "6.0.0", default-features = false, path = "../trie" }
 
 [dev-dependencies]
 hex-literal = "0.3.4"
-pretty_assertions = "1.0.0"
+pretty_assertions = "1.2.1"
 rand = "0.7.2"
 sp-runtime = { version = "6.0.0", path = "../runtime" }