Bug 1540262 - increase UV chunks from 12 to 16, r=tomprince

Differential Revision: https://phabricator.services.mozilla.com/D25673

--HG--
extra : moz-landing-system : lando

taskcluster/ci/release-update-verify/kind.yml

@@ -32,7 +32,7 @@ job-defaults:
       retry-exit-status:
          - 255
    extra:
-      chunks: 12
+      chunks: 16
 
 jobs:
    firefox-linux64: