remove now unneeded mypy missing entries

mypy.ini

@@ -4,23 +4,3 @@ warn_unused_ignores = True
 
 # 3rd party libraries without stubs (yet)
 
-[mypy-attrs_strict.*]  # a bit sad, but...
-ignore_missing_imports = True
-
-[mypy-deprecated.*]
-ignore_missing_imports = True
-
-[mypy-django.*]  # false positive, only used my hypotesis' extras
-ignore_missing_imports = True
-
-[mypy-dulwich.*]
-ignore_missing_imports = True
-
-[mypy-iso8601.*]
-ignore_missing_imports = True
-
-[mypy-pkg_resources.*]
-ignore_missing_imports = True
-
-[mypy-pytest.*]
-ignore_missing_imports = True