python3Packages.llama-index-vector-stores-google: fix build by setting hatchling as build-system

pkgs/development/python-modules/llama-index-vector-stores-google/default.nix

···
   fetchPypi,
   google-generativeai,
   llama-index-core,
-  poetry-core,
+  hatchling,
   pythonOlder,
 }:
 
···
   pythonRelaxDeps = [ "google-generativeai" ];
 
   build-system = [
-    poetry-core
+    hatchling
   ];
 
   dependencies = [