test: stabilize transport admission deadline

tests/test_gitea_transport.py

@@ -234,7 +234,7 @@ async def test_streaming_reads_share_the_same_bounded_read_capacity():
     try:
         await asyncio.wait_for(saturated.wait(), timeout=0.2)
         with pytest.raises(gitea_proxy.GiteaOverloadedError):
-            await asyncio.wait_for(gitea_proxy.fetch("third"), timeout=0.1)
+            await asyncio.wait_for(gitea_proxy.fetch("third"), timeout=1.0)
     finally:
         release.set()
         await asyncio.gather(*streams)