Remove obsolete Mypy faster-cache extra

Author: adamtheturtle

pyproject.toml

@@ -46,7 +46,7 @@ dev = [
     "furo==2025.12.19",
     "hypothesis==6.168.0",
     "interrogate==1.7.0",
-    "mypy[faster-cache]==2.3.1",
+    "mypy==2.3.1",
     "mypy-strict-kwargs==2026.8.25.1",
     "no-defaults==2026.9.1",
     "prek==0.5.3",