workflows: Fix npm-update
workflows: Fix npm-update

Pushing to the cockpituous fork failed due to

   ! [remote rejected] HEAD -> npm-update-qunit-20201201-144141 (shallow update not allowed)

Fetch the full history to fix that.

Closes #14992
martinpitt/cockpit,mvollmer/cockpit,cockpit-project/cockpit,martinpitt/cockpit,mvollmer/cockpit,cockpit-project/cockpit,martinpitt/cockpit,garrett/cockpit,cockpit-project/cockpit,martinpitt/cockpit,garrett/cockpit,deryni/cockpit,garrett/cockpit,deryni/cockpit,garrett/cockpit,cockpit-project/cockpit,mvollmer/cockpit,deryni/cockpit,deryni/cockpit,mvollmer/cockpit,cockpit-project/cockpit,mvollmer/cockpit,garrett/cockpit,martinpitt/cockpit,deryni/cockpit,deryni/cockpit,deryni/cockpit