Update dependency @vue/cli-plugin-unit-jest to v5.0.0-beta.3

Author: renovate-bot

frontend/package-lock.json

@@ -30,7 +30,7 @@
     "@vue/cli-plugin-eslint": "4.5.13",
     "@vue/cli-plugin-router": "4.5.13",
     "@vue/cli-plugin-typescript": "4.5.13",
-    "@vue/cli-plugin-unit-jest": "5.0.0-beta.2",
+    "@vue/cli-plugin-unit-jest": "5.0.0-beta.3",
     "@vue/cli-plugin-vuex": "4.5.13",
     "@vue/cli-service": "4.5.13",
     "@vue/compiler-sfc": "3.2.1",