fix(tests): Set jest max workers to 1
fix(tests): Set jest max workers to 1

Set jest maxWorkers to one to reduce memory usage while testing
SirLamer/bootstrap-vue,bootstrap-vue/bootstrap-vue,sschadwick/bootstrap-vue,sschadwick/bootstrap-vue,tmorehouse/bootstrap-vue,bootstrap-vue/bootstrap-vue,SirLamer/bootstrap-vue,tmorehouse/bootstrap-vue,sschadwick/bootstrap-vue