fix: bump minimum anyio version to 4.10 to fix lowest-direct CI

anyio 4.5.0 has an internal inconsistency where its asyncio backend
(_backends/_asyncio.py) tries to import RunFinishedError from
_core/_exceptions, but that exception doesn't exist in version 4.5.0.

This causes ImportError when tests try to set up fixtures with
--resolution lowest-direct, which installs anyio 4.5.0 (the previous
minimum version constraint).

Bumping to anyio>=4.10 ensures lowest-direct resolution installs a
version without this internal inconsistency.

Github-Issue: #1325

Author: felixweinberger

pyproject.toml

@@ -22,7 +22,7 @@ classifiers = [
     "Programming Language :: Python :: 3.13",
 ]
 dependencies = [
-    "anyio>=4.5",
+    "anyio>=4.10",
     "httpx>=0.27.1",
     "httpx-sse>=0.4",
     "pydantic>=2.11.0,<3.0.0",