fix: Suppress mypy await type error in AsyncHttpTransport._request

The base class _make_pool returns a union of sync and async pool types,
so mypy sees _pool.request() as possibly returning a non-awaitable.
Add type: ignore[misc] since within AsyncHttpTransport the pool is
always an async type.

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

Author: BYK

sentry_sdk/transport.py

@@ -825,7 +825,7 @@ async def _request(  # type: ignore[override,unused-ignore]
             body: "Any",
             headers: "Mapping[str, str]",
         ) -> "httpcore.Response":
-            return await self._pool.request(
+            return await self._pool.request(  # type: ignore[misc,unused-ignore]
                 method,
                 self._auth.get_api_url(endpoint_type),
                 content=body,