Add pywin32 type stubs and fix pyright issues

- Add types-pywin32<310.0.0 to dev dependencies (Python 3.8 compatible)
- Add inline type ignores for gencache attributes missing from stubs
- Pyright now passes with 0 errors, 0 warnings

Author: ctoth

libloader/com.py

@@ -9,13 +9,13 @@
 
 def prepare_gencache():
     logger.debug("Preparing gencache for COM object loading")
-    gencache.is_readonly = False
-    gencache.GetGeneratePath()
+    gencache.is_readonly = False  # type: ignore[attr-defined]
+    gencache.GetGeneratePath()  # type: ignore[attr-defined]
 
 
 def load_com(*names):
     logger.debug("Attempting to load COM objects: %s", names)
-    if gencache.is_readonly:
+    if gencache.is_readonly:  # type: ignore[attr-defined]
         prepare_gencache()
     result = None
     failed_names = []

pyproject.toml

@@ -34,6 +34,7 @@ dependencies = [
 dev = [
     "ruff>=0.8.0",
     "pyright>=1.1.0",
+    "types-pywin32<310.0.0",
 ]
 
 [tool.ruff]