matrix-synapse: 1.49.2 -> 1.50.1

[sumnerevans]

Also adds the matrix-common library

Motivation for this change

https://github.com/matrix-org/synapse/releases/tag/v1.50.1

Things done

Running on my server without any issues

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 22.05 Release Notes (or backporting 21.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
  • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• Fits CONTRIBUTING.md.

[ajs124]

Apparently upstream is having some issues with this release. Is the config we generate affected by that?

[sumnerevans]

looks like our default has client before webclient, which according to matrix-org/synapse#11763 will fail

        default = [{
          port = 8448;
          bind_address = "";
          type = "http";
          tls = true;
          x_forwarded = false;
          resources = [
            { names = ["client" "webclient"]; compress = true; }
            { names = ["federation"]; compress = false; }
          ];
        }];

[github-actions]

Successfully created backport PR #156103 for release-21.11.