fix: switch to lowest supported python version for testing running

Author: Elan456

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: "3.10"
+          python-version: "3.8"
 
       - name: Create venv for maturin develop
         run: python -m venv .venv

pysrc/fastquadtree/_base_quadtree.py

@@ -8,7 +8,6 @@
     Any,
     Generic,
     Iterable,
-    Self,
     Sequence,
     Tuple,
     TypeVar,
@@ -19,6 +18,8 @@
 from ._obj_store import ObjStore
 
 if TYPE_CHECKING:
+    from typing import Self  # Only in Python 3.11+
+
     from numpy.typing import NDArray
 
 Bounds = Tuple[float, float, float, float]