ci: increase shards for karma tests
ci: increase shards for karma tests

This should help to reduce heap out of memory errors during Karma tests.

catull/angular-cli,clydin/angular-cli,angular/angular-cli,Brocco/angular-cli,catull/angular-cli,geofffilippi/angular-cli,clydin/angular-cli,catull/angular-cli,Brocco/angular-cli,angular/angular-cli,Brocco/angular-cli,geofffilippi/angular-cli,Brocco/angular-cli,geofffilippi/angular-cli,geofffilippi/angular-cli,Brocco/angular-cli,clydin/angular-cli,angular/angular-cli,catull/angular-cli,angular/angular-cli,clydin/angular-cli