Fix issues and switch to uv for tox run install

`uv` works in parallel and runs far faster

Author: CoolCat467

dataclass_wizard/type_def.py

@@ -166,7 +166,7 @@ class ExplicitNullType:
     __slots__ = ()  # Saves memory by preventing the creation of instance dictionaries
 
     # Class-level instance variable for singleton control
-    _instance: ExplicitNullType | None = None
+    _instance: "ExplicitNullType | None" = None
 
     def __new__(cls):
         if cls._instance is None:

pyproject.toml

@@ -222,17 +222,17 @@ exclude_also = [
     "if TYPE_CHECKING.*:",
     # This will exclude all lines starting with something like
     # if PY311_OR_ABOVE: or if PY310_BETA:.
-    "if PY\d+_\w+:",
+    'if PY\d+_\\w+:',
     # Don't complain if tests don't hit defensive assertion code:
     "raise AssertionError",
     "raise NotImplementedError",
     # Ellipsis are used as placeholders in python 3 that will be overridden
-    "\.\.\.",
+    "\\.\\.\\.",
     # Don't complain if non-runnable code isn't run:
     "if 0:",
-    "if __name__ == .__main__.:"
+    "if __name__ == .__main__.:",
     # Don't complain if alias functions aren't run:
-    "alias:"
+    "alias:",
 ]
 ignore_errors = true
 
@@ -259,11 +259,8 @@ commands = flake8 dataclass_wizard tests
 setenv =
     PYTHONPATH = {toxinidir}
     PYTEST_ADDOPTS = --ignore-glob=*integration*
-deps =
-    -r{toxinidir}/requirements-dev.txt
-    -r{toxinidir}/requirements-test.txt
 commands =
-    pip install -U pip
-    pip install -e .[all]
+    pip install -U pip uv
+    uv pip install -e .[all]
     pytest --basetemp={envtmpdir}
 """