chore: release v1.21.0

nix/config/release.nix

@@ -2,8 +2,8 @@
   # this file is generated by nix/scripts/init-project.nix
   # please don't edit it manually
 
-  version = "v1.20.3";
-  commit = "211f0e2cb6eaa626efca70f9daa5e26e9ce189bc";
+  version = "v1.21.0";
+  commit = "586cb3b89abd8e33e890225a4c5a677bfe72500d";
   projectURL = "https://gitlab.schukai.com/oss/libraries/go/services/job-queues";
   name = "job-queues";
   mnemonic = "job-queues";