Configure asyncio_default_fixture_loop_scope

This resolves:

    PytestDeprecationWarning: The configuration option "asyncio_default_fixture_loop_scope" is unset.
    The event loop scope for asynchronous fixtures will default to the fixture caching scope. Future versions of pytest-asyncio will default the loop scope for asynchronous fixtures to function scope. Set the default fixture loop scope explicitly in order to avoid unexpected behavior in the future. Valid fixture loop scopes are: "function", "class", "module", "package", "session"

See https://pytest-asyncio.readthedocs.io/en/latest/reference/configuration.html#asyncio-default-fixture-loop-scope

Accordingly, we need to update pytest_asyncio.fixture following
https://pytest-asyncio.readthedocs.io/en/latest/how-to-guides/migrate_from_0_23.html.

pytest.ini

@@ -1,5 +1,6 @@
 [pytest]
 addopts = -vvv --strict-markers --showlocals --doctest-modules --ignore pgtoolkit/ctl.py
 asyncio_mode = strict
+asyncio_default_fixture_loop_scope = function
 filterwarnings =
   error

tests/test_ctl_func.py

@@ -16,7 +16,7 @@ def pgctl() -> ctl.PGCtl:
         pytest.skip(str(e))
 
 
-@pytest_asyncio.fixture(scope="module")
+@pytest_asyncio.fixture(loop_scope="module")
 async def apgctl() -> ctl.AsyncPGCtl:
     try:
         return await ctl.AsyncPGCtl.get()
@@ -51,7 +51,7 @@ def initdb(tmp_path_factory, pgctl: ctl.PGCtl) -> tuple[Path, Path, Path]:
     return datadir, waldir, pid_path
 
 
-@pytest_asyncio.fixture(scope="module")
+@pytest_asyncio.fixture(loop_scope="module")
 async def ainitdb(tmp_path_factory, apgctl: ctl.AsyncPGCtl) -> tuple[Path, Path, Path]:
     datadir = tmp_path_factory.mktemp("data")
     waldir = tmp_path_factory.mktemp("wal")