Make EE dependencies specs compatible w/ BootstrapVue 2

ee/spec/frontend/dependencies/components/app_spec.js

@@ -38,6 +38,7 @@ describe('DependenciesApp component', () => {
       localVue,
       store,
       sync: false,
+      attachToDocument: true,
       propsData: { ...props },
       stubs,
     });

ee/spec/frontend/dependencies/components/dependencies_actions_spec.js

@@ -22,6 +22,7 @@ describe('DependenciesActions component', () => {
       localVue,
       store,
       sync: false,
+      attachToDocument: true,
       propsData: { ...propsData },
     });
   };

ee/spec/frontend/dependencies/components/dependency_license_links_spec.js

@@ -19,6 +19,8 @@ describe('DependencyLicenseLinks component', () => {
 
     const localVue = createLocalVue();
     wrapper = shallowMount(localVue.extend(DependenciesLicenseLinks), {
+      sync: false,
+      attachToDocument: true,
       localVue,
       propsData: {
         licenses,