chore(pyproject.toml) - remove pillow from tests as it's a normal dependency

Author: K0lb3

pyproject.toml

@@ -58,7 +58,7 @@ dynamic = ["version"]
 # optional dependencies must be lowercase/normalized
 ttgen = ["typetreegeneratorapi>=0.0.5"]
 full = ["unitypy[ttgen]"]
-tests = ["pytest", "pillow", "psutil", "unitypy[full]"]
+tests = ["pytest", "psutil", "unitypy[full]"]
 dev = ["ruff", "unitypy[tests]"]
 
 [project.urls]