Support uvloop >= 0.18 and the loop_factory argument

This brings Hypercorn in line with what is required for Python 3.13
onwards.

Author: pgjones

pyproject.toml

@@ -38,7 +38,7 @@ taskgroup = { version = "*", python = "<3.11", allow-prereleases = true }
 tomli = { version = "*", python = "<3.11" }
 trio = { version = ">=0.22.0", optional = true }
 typing_extensions = { version = "*", python = "<3.11" }
-uvloop = { version = "*", markers = "platform_system != 'Windows'", optional = true }
+uvloop = { version = ">=0.18", markers = "platform_system != 'Windows'", optional = true }
 wsproto = ">=0.14.0"
 
 [tool.poetry.dev-dependencies]

src/hypercorn/asyncio/run.py

@@ -207,8 +207,6 @@ def uvloop_worker(
         import uvloop
     except ImportError as error:
         raise Exception("uvloop is not installed") from error
-    else:
-        asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
 
     app = load_application(config.application_path, config.wsgi_max_body_size)
 
@@ -220,6 +218,7 @@ def uvloop_worker(
         partial(worker_serve, app, config, sockets=sockets),
         debug=config.debug,
         shutdown_trigger=shutdown_trigger,
+        loop_factory=uvloop.new_event_loop,
     )
 
 
@@ -228,8 +227,9 @@ def _run(
     *,
     debug: bool = False,
     shutdown_trigger: Optional[Callable[..., Awaitable[None]]] = None,
+    loop_factory: Callable[[], asyncio.AbstractEventLoop] | None = None,
 ) -> None:
-    with Runner(debug=debug) as runner:
+    with Runner(debug=debug, loop_factory=loop_factory) as runner:
         runner.get_loop().set_exception_handler(_exception_handler)
         runner.run(main(shutdown_trigger=shutdown_trigger))