fix(vcr): allow loopback hosts in vcr_config to support Windows asyncio self-pipe

Author: aoright

tests/conftest.py

@@ -120,6 +120,12 @@ def vcr_config() -> dict[str, Any]:
         VCR configuration passed to `VCR.use_cassettes`.
     """
     return {
+        # --block-network (see addopts) blocks every socket connect, which on Windows
+        # takes the suite down before a single test runs: there the ProactorEventLoop
+        # builds its self-pipe with socket.socketpair(), whose Windows fallback
+        # connects to 127.0.0.1, so asyncio.run() itself raises "Network is disabled".
+        # Loopback is the only host let back through; provider endpoints stay blocked.
+        "allowed_hosts": ["127.0.0.1", "localhost"],
         # The registered JSON serializer keeps HTTP bodies as nested objects, so the
         # cassette diffs like its payloads instead of escaped string literals.
         "serializer": "json",