Fix issue with creating new projects Windows

The previous code contained a bug where git couldn't reside
in relative subdirectory.

It appears to have done this in attempt to get the absolute
path of the git executable. Instead, I just use resolve
to resolve potential symlinks, etc.

Author: brycepg

src/poetry/core/vcs/git.py

@@ -168,12 +168,9 @@ def executable() -> str:
             if not path:
                 continue
 
-            _path = Path(path.strip())
-            try:
-                _path.relative_to(Path.cwd())
-            except ValueError:
+            _path = Path(path.strip()).resolve()
+            if _path.drive == Path.cwd().drive:
                 _executable = str(_path)
-
                 break
     else:
         _executable = "git"