ruff is not needed to run tests.

--- dirty_equals-0.10.0/pyproject.toml.orig
+++ dirty_equals-0.10.0/pyproject.toml
@@ -52,7 +52,6 @@
     "packaging>=25.0",
     "pydantic>=2.10.6",
     "pytest>=8.3.5",
-    "ruff>=0.13.1",
     "types-pytz>=2024.2.0.20241221",
 ]
 # TODO update these deps to newer versions, I just froze them while migrationg from requirements files