fix: Normalize the root_dir before comparison (#20)

We normalize `root_dir` before comparison.
Another solution would be to avoid comparing path with

`!=` or `==`

and use `os.path.samefile()` But I followed the "normalization" approach
the project is currently using.

Author: mhandb

rustimport/importable.py

@@ -161,7 +161,7 @@ def __manifest_path(self) -> str:
     @cached_property
     def __workspace_path(self) -> Optional[str]:
         """Returns the path of the cargo workspace this crate belongs to, if there is any."""
-        root_dir = os.path.abspath(".").split(os.path.sep)[0] + os.path.sep
+        root_dir = os.path.realpath(".").split(os.path.sep)[0] + os.path.sep
         p = self.__crate_path
         while os.path.dirname(p) != root_dir:  # loop through all parent directories...
             p = os.path.dirname(p)