chore(deps): update dependency mypy to v1.20.0

Author: renovate[bot]

pyproject.toml

@@ -67,7 +67,7 @@ dev = [
     "django-test-migrations==1.5.0",
     "djangorestframework-stubs==3.16.8",
     "factory-boy==3.3.3",
-    "mypy[faster-cache]==1.19.1",
+    "mypy[faster-cache]==1.20.0",
     "pandas-stubs==3.0.0.260204",
     "prek==0.3.8",
     "pytest==9.0.2",