gprof2dot: do not use pypy

- The package does not seem to function with `pypy` (#33997)
- Our default interpreter should be used. If one wants extra performance
(e.g. using PyPy) they can override or modify the expression however
they want, but not in Nixpkgs.

(cherry picked from commit fbaf5fd677)

pkgs/top-level/all-packages.nix

@@ -2347,10 +2347,7 @@ with pkgs;
     callPackage ../tools/misc/graylog/plugins.nix { }
   );
 
-  gprof2dot = callPackage ../development/tools/profiling/gprof2dot {
-    # Using pypy provides significant performance improvements (~2x)
-    pythonPackages = pypyPackages;
-  };
+  gprof2dot = callPackage ../development/tools/profiling/gprof2dot { };
 
   graphviz = callPackage ../tools/graphics/graphviz {
     inherit (darwin.apple_sdk.frameworks) ApplicationServices;