Set asyncio_default_fixture_loop_scope to suppress pytest-asyncio warning

pytest-asyncio warns that future versions will default the loop scope
for async fixtures to function scope. Set it explicitly to "function"
to suppress the deprecation warning and ensure consistent behavior.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: laughingman7743

pyproject.toml

@@ -110,6 +110,7 @@ version-file = "pyathena/_version.py"
 
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
+asyncio_default_fixture_loop_scope = "function"
 norecursedirs = [
     "benchmarks",
     ".venv",