Fix test failures on Python 3.14 (#394)

* Fix test failures on Python 3.14

As documented at
https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.get_event_loop,
`get_event_loop` now fails if there is no active event loop. Since there
will never already be one at the top level of a file anyway, explicitly
create a new one every time.

* Reformat with black 2026 style

.github/workflows/wheels.yml

@@ -53,7 +53,7 @@ jobs:
           CIBW_ARCHS: ${{ matrix.arch }}
           # TODO: Disable building PyPy wheels. If the build system gets modernized, this should be
           # auto-detected based on the Cython dependency.
-          CIBW_SKIP: pp* cp314*
+          CIBW_SKIP: pp*
           CIBW_TEST_REQUIRES: pytest pytest-asyncio
           CIBW_TEST_COMMAND: pytest {project}
           # Only needed to make the macosx arm64 build work