🐛 Fix msgspec recipe import on Python 3.8/3.9

The msgspec recipe added in #3316 uses PEP 585 generic syntax
(dict[str, Any]) in function signatures. Python 3.8 raises
"TypeError: 'type' object is not subscriptable" at import time
because dict only became subscriptable at runtime in Python 3.9.

Adding `from __future__ import annotations` defers annotation
evaluation to strings (PEP 563), restoring 3.8 compatibility.
This release still officially supports Python 3.8 / 3.9.

Author: AndreMiras

pythonforandroid/recipes/msgspec/__init__.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from typing import Any
 
 from pythonforandroid.archs import Arch