remove liburing from devshell

This doesn't seem to be necessary to build, and the derivation is broken
in pkgsStatic.

flake.nix

@@ -180,10 +180,6 @@
           # Useful for editing the book locally
           mdbook
         ])
-        ++ (if !pkgsHost.stdenv.isDarwin then [
-            # Needed for building with io_uring
-            pkgsHost.liburing
-        ] else [])
         ++ scopeHost.main.propagatedBuildInputs
         ++ scopeHost.main.nativeBuildInputs;
       };