chore(nix): relax lz4 dependency requirement

4.4.3 doesn't have aarch64 wheels python-lz4/python-lz4#298

Author: qkaiser

overlay.nix

@@ -31,6 +31,8 @@ final: prev:
 
       dependencies = (super.dependencies or [ ]) ++ [ final.python3.pkgs.pyzstd ];
 
+      pythonRelaxDeps = [ "lz4" ];
+
       # remove this when packaging changes are upstreamed
       cargoDeps = final.rustPlatform.importCargoLock {
         lockFile = ./Cargo.lock;