fix: update Python version requirements to support 3.10 and adjust CI workflow

pyfragment/types/constants.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import json
 from typing import Any, Literal, get_args
 

pyfragment/types/exceptions.py

@@ -1,3 +1,6 @@
+from __future__ import annotations
+
+
 class FragmentError(Exception):
     """Base exception for all pyfragment library errors."""
 

pyfragment/types/results.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from dataclasses import dataclass
 from typing import Any