deps: update pretty_assertions requirement from 0.6 to 1.4 (#449)

Updates the requirements on [pretty_assertions](https://github.com/rust-pretty-assertions/rust-pretty-assertions) to permit the latest version.
- [Release notes](https://github.com/rust-pretty-assertions/rust-pretty-assertions/releases)
- [Changelog](https://github.com/rust-pretty-assertions/rust-pretty-assertions/blob/main/CHANGELOG.md)
- [Commits](rust-pretty-assertions/rust-pretty-assertions@v0.6.0...v1.4.1)

---
updated-dependencies:
- dependency-name: pretty_assertions
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Felix Mölder <felix.moelder@uk-essen.de>

Cargo.toml

@@ -47,6 +47,6 @@ static = ["hts-sys/static"]
 
 [dev-dependencies]
 bincode = "1.2"
-pretty_assertions = "0.6"
+pretty_assertions = "1.4"
 serde_json = "1.0"
 tempfile = "3.1.0"