gemini-cli-bin: deprecate phases

pkgs/by-name/ge/gemini-cli-bin/package.nix

···
     hash = "sha256-SRtl8FPMI0VBz0hzmyvtGYPO3mdnm60gu2zlStb5r98=";
   };
 
-  phases = [
-    "installPhase"
-    "fixupPhase"
-    "installCheckPhase"
-  ];
+  dontUnpack = true;
 
   strictDeps = true;