Enable strict and subtract options

If you weren't aware this achieves the same effect, and a bit easier to keep up-to-date https://mypy.readthedocs.io/en/stable/existing_code.html#introduce-stricter-options

Author: paddyroddy

pyproject.toml

@@ -47,19 +47,8 @@ convention = "numpy"
 [tool.mypy]
 python_version = "3.9"
 # Block below are checks that form part of mypy 'strict' mode
-warn_unused_configs = true
-warn_redundant_casts = true
-warn_unused_ignores = true
-strict_equality = true
-strict_concatenate = true
-check_untyped_defs = true
+strict = true
 disallow_subclassing_any = false # TODO: fix
-disallow_untyped_decorators = true
-disallow_any_generics = true
-disallow_untyped_calls = true
-disallow_incomplete_defs = true
-disallow_untyped_defs = true
-no_implicit_reexport = true
 warn_return_any = false # TODO: fix
 ignore_missing_imports = true