feat: Don't ignore missing imports in general

Only for the two libraries for which it's necessary. See
<https://mypy.readthedocs.io/en/latest/command_line.html#cmdoption-mypy-ignore-missing-imports>.

Author: l0b0

mypy.ini

@@ -6,11 +6,16 @@ disallow_subclassing_any = True
 disallow_untyped_calls = True
 disallow_untyped_decorators = True
 disallow_untyped_defs = True
-ignore_missing_imports = True
 no_implicit_optional = True
 show_error_codes = True
 strict_equality = True
 warn_redundant_casts = True
 warn_return_any = True
 warn_unused_configs = True
 warn_unused_ignores = True
+
+[mypy-jsonschema.*]
+ignore_missing_imports = True
+
+[mypy-setuptools.*]
+ignore_missing_imports = True