fix: update mypy config for CI compatibility

Bump python_version to 3.9 (mypy dropped 3.8 support) and add PIL
to ignore_missing_imports.

Author: scyyh11

pyproject.toml

@@ -75,12 +75,12 @@ markers = [
 addopts = "-m 'not resource_intensive'"
 
 [tool.mypy]
-python_version = "3.8"
+python_version = "3.9"
 packages = ["paddleocr"]
 warn_return_any = false
 warn_unused_configs = true
 disallow_untyped_defs = false
 
 [[tool.mypy.overrides]]
-module = ["paddlex.*", "paddle.*", "yaml.*", "requests.*"]
+module = ["paddlex.*", "paddle.*", "yaml.*", "requests.*", "PIL.*"]
 ignore_missing_imports = true