nix: Move parallelCurl to devTools

This is not a with-tool, because it doesn't wrap another command.

nix/tools/withTools.nix

@@ -296,31 +296,6 @@ let
         done
       '';
 
-  parallelCurl =
-    checkedShellScript
-      {
-        name = "parallel-curl";
-        docs = "wrapper for using <num> parallel curl requests on the same <host>";
-        args = [
-          "ARG_POSITIONAL_SINGLE([num], [number of parallel requests])"
-          "ARG_POSITIONAL_SINGLE([host], [host])"
-          "ARG_LEFTOVERS([extra arguments for curl])"
-        ];
-      }
-      ''
-        curl_command="${curl}/bin/curl --parallel --parallel-immediate "
-        curl_command+="''${_arg_leftovers[*]} "
-
-        x=1
-        while [ $x -le "$1" ]
-        do
-          curl_command+="$_arg_host "
-          x=$((x + 1))
-        done
-
-        eval "$curl_command"
-      '';
-
   withPgrst =
     checkedShellScript
       {
@@ -378,7 +353,7 @@ in
 buildToolbox
 {
   name = "postgrest-with";
-  tools = [ withPgAll withGit withPgrst withSlowPg withSlowPgrst parallelCurl ] ++ withPgVersions;
+  tools = [ withPgAll withGit withPgrst withSlowPg withSlowPgrst ] ++ withPgVersions;
   # make withTools available for other nix files
   extra = { inherit withGit withPg withPgAll withPgrst withSlowPg withSlowPgrst; };
 }