Yesterday's update to `anyio` breaks startlette

[Marcelo Trylesinski]

Discussed in #2261

^{Originally posted by fernandosilveira August 31, 2023}
Yesterday anyio updated to version 4.0.0 and starlette accepts anything >=3.4.0.

Apparently, the latest anyio no longer has start_blocking_portal, thus breaking the test client (e.g., here).

I haven't looked deep enough into it but I suppose it's reasonable that anyio did not feel obliged to maintain backwards compatibility on a major version upgrade.

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[Marcelo Trylesinski]

Case closed: #2261

Thanks @agronholm

[Raph Estrada]

Just for anyone who finds this: we also had the reported error in our (somewhat old) fast API project. As per the linked discussion we pinned anyio to 3.7.1 which has allowed the tests to pass again. Pin your dependencies, friends.

[Alex Grönholm]

FastAPI itself pinned AnyIO to < 4 in the 0.103.1 release.