[patch] Import annotations for 3.9 compatibility with type hint sugar (…

…#24)

pyiron_snippets/resources.py

@@ -2,6 +2,8 @@
 Classes to find data files and executables in global paths.
 """
 
+from __future__ import annotations
+
 from abc import ABC, abstractmethod
 from collections.abc import Iterator, Iterable
 import os