test: revert to v2.0.0-beta.13

v2.0.0-rc.0 had changes to emits that are breaking
tests. vuejs/test-utils#296

packages/vuetify/package.json

@@ -71,7 +71,7 @@
     "@types/jest": "^26.0.14",
     "@types/node": "^14.11.10",
     "@vue/babel-plugin-jsx": "^1.0.2",
-    "@vue/test-utils": "^2.0.0-rc.2",
+    "@vue/test-utils": "2.0.0-beta.13",
     "autoprefixer": "^9.6.1",
     "babel-loader": "^8.0.6",
     "babel-plugin-add-import-extension": "^1.4.3",

yarn.lock

@@ -4653,7 +4653,7 @@
     webpack "^4.0.0"
     webpack-bundle-analyzer "^3.8.0"
     webpack-chain "^6.4.0"
-    webpack-dev-server "3.9.0"
+    webpack-dev-server "^3.11.0"
     webpack-merge "^4.2.2"
   optionalDependencies:
     vue-loader-v16 "npm:vue-loader@^16.0.0-beta.3"
@@ -4799,10 +4799,10 @@
   resolved "https://registry.yarnpkg.com/@vue/shared/-/shared-3.0.7.tgz#96d52988efc07444c108c7c6803ba7cc93e40045"
   integrity sha512-dn5FyfSc4ky424jH4FntiHno7Ss5yLkqKNmM/NXwANRnlkmqu74pnGetexDFVG5phMk9/FhwovUZCWGxsotVKg==
 
-"@vue/test-utils@^2.0.0-rc.2":
-  version "2.0.0-rc.2"
-  resolved "https://registry.yarnpkg.com/@vue/test-utils/-/test-utils-2.0.0-rc.2.tgz#a43cb6d1a30d16bb50fa3561397ba1e252683f9d"
-  integrity sha512-doOtnkleRTiN5rk+Losawe9/8i//8rncZ3lIhz/1vnONHDnthF1XjlI7pGZ1RV5uZJ3IUt3yVjwY7W6q9WhlRw==
+"@vue/[email protected]beta.13":
+  version "2.0.0-beta.13"
+  resolved "https://registry.yarnpkg.com/@vue/test-utils/-/test-utils-2.0.0-beta.13.tgz#482aa29f4e80a713e03e22b736d7465d56909e66"
+  integrity sha512-Au+yGMBPvrtcmPP6W4ielTbNJd3equxVOq1iL0DvpAZJwkGOrdBfFTomMhANODiBVyIEE8HMxhr7YIwDHWO36w==
 
 "@vue/web-component-wrapper@^1.2.0":
   version "1.2.0"