invoke: Update Context.cd() to accept a pathlib.Path or a string (#9823)

Author: rouge8

stubs/invoke/invoke/context.pyi

@@ -1,3 +1,4 @@
+import pathlib
 from contextlib import AbstractContextManager
 
 from .config import Config, DataProxy
@@ -13,7 +14,7 @@ class Context(DataProxy):
     def prefix(self, command: str) -> AbstractContextManager[None]: ...
     @property
     def cwd(self) -> str: ...
-    def cd(self, path: str) -> AbstractContextManager[None]: ...
+    def cd(self, path: str | pathlib.Path) -> AbstractContextManager[None]: ...
 
 class MockContext(Context):
     def __init__(self, config: Config | None = ..., **kwargs) -> None: ...