chore(nint): move from //users/sterni to //nix

Since //web/bubblegum depends on nint, we need to move it to a non user
directory to conform with the policy established via cl/3434.
Note that this likely doesn't mean greater stability (which isn't
really implied in depot anyways), since I still would like to use a more
elaborate calling convention to allow for additional useful features.

Change-Id: I616f905d8df13e3363674aab69a797b0d39fdd79
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3506
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

web/bubblegum/default.nix

@@ -7,6 +7,7 @@ let
     getBins
     utils
     sparseTree
+    nint
     ;
 
   minimalDepot = sparseTree depot.path [
@@ -186,7 +187,7 @@ let
     else "${scriptName}/${path}";
 
   bins = getBins pkgs.coreutils [ "env" "tee" "cat" "printf" "chmod" ]
-      // getBins depot.users.sterni.nint [ "nint" ];
+      // getBins nint [ "nint" ];
 
   /* Type: args -> either path derivation string -> derivation
   */