chore: fix version path file reading

Author: steveoh

setup.py

@@ -10,7 +10,7 @@
 
 #: Load version from source file
 version = {}
-version_file = Path(__file__) / "src" / "projectname" / "version.py"
+version_file = Path(__file__).parent / "src" / "projectname" / "version.py"
 exec(version_file.read_text(), version)
 
 setup(