build(deps): update dirty-equals requirement

Updates the requirements on [dirty-equals](https://github.com/samuelcolvin/dirty-equals) to permit the latest version.
- [Release notes](https://github.com/samuelcolvin/dirty-equals/releases)
- [Commits](samuelcolvin/dirty-equals@v0.7.0...v0.8.0)

---
updated-dependencies:
- dependency-name: dirty-equals
  dependency-type: direct:production
...

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

requirements.test.txt

@@ -2,4 +2,4 @@
 
 coverage[toml] >=7.2.0,<8.0.0
 pytest >=8.0.0,<9
-dirty-equals >=0.7.0,<0.8
+dirty-equals >=0.7.0,<0.9