chore(3p/sources): Bump channels & overlays

* //users/tazjin/predlozhnik: bump wasm-bindgen & run `cargo update`

* //users/Profpatsch/writers:
  use proper keyword syntax to make make flake8 happy.

* //third_party/nixpkgs: pick binaryen from stable channel

Change-Id: Ia711d8c396aa09b78413d80f35eedf63fa315596
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6118
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: Profpatsch <mail@profpatsch.de>

third_party/nixpkgs/default.nix

@@ -52,6 +52,9 @@ let
 
       # ntfy does not build on unstable as of 2022-08-02
       ntfy
+
+      # binaryen does not build on unstable as of 2022-08-22
+      binaryen
       ;
   };