fix(mypy): restore python_version to 3.14

The real fix was adding 'from __future__ import annotations' to modules,
not downgrading the target version. mypy 1.19.0 supports Python 3.14.

Author: CybotTM

pyproject.toml

@@ -117,7 +117,7 @@ exclude_lines = [
 ]
 
 [tool.mypy]
-python_version = "3.12"
+python_version = "3.14"
 warn_return_any = true
 warn_unused_configs = true
 disallow_untyped_defs = false