solution: use gradle 7.2

Co-authored-by: Brian McGee <brian@41north.dev>

nix/nixpkgs.nix

@@ -0,0 +1,9 @@
+{ system ? builtins.currentSystem }:
+let
+  sources = import ./sources.nix;
+in
+import sources.nixpkgs {
+  inherit system;
+  config = { };
+  overlays = [ ];
+}