matrix-synapse wants prometheus-client < 0.4.0, we have 0.4.2 on master branch

[7c6f434c]

Issue description

The freshest currently released upstream Matrix Synapse version is 0.34.0 (we have 0.33.9), and it still wants prometheus-client with version <0.4.0. We currently have exactly one version of pythonPackages.prometheus_client, and it is 0.4.2. What would be the best way for updating matrix-synapse? A privately cloned prometheus-client expression (which will probably then fall even more out of date than needed, but Matrix seems to still support quite old versions anyway)? Or should I try to remove the constraint and see if something clearly breaks?

@FRidh I am not fully sure from reading NixOS/rfcs#24 which option is better.

Steps to reproduce

nix build matrix-synapse

[bachp]

There is already in issue on the synapse repository matrix-org/synapse#4221

[7c6f434c]

Oh well, I guess it replaces the second option «with break the pin and get breakage», so for this specific case there is a natural choice. Thanks.

[bachp]

@7c6f434c Will you come up with a PR to fix this issue?

[7c6f434c]

No.

[7c6f434c]

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