fix: upgrade vue from 2.6.14 to 2.7.16

Snyk has created this PR to upgrade vue from 2.6.14 to 2.7.16.

See this package in npm:
vue

See this project in Snyk:
https://app.snyk.io/org/e-evolution/project/cf2abcde-2ee9-4c5f-9631-69916544bee4?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -76,7 +76,7 @@
     "tui-editor": "1.4.10",
     "v-markdown": "^1.0.2",
     "v-markdown-editor": "^1.2.6",
-    "vue": "2.6.14",
+    "vue": "2.7.16",
     "vue-count-to": "1.0.13",
     "vue-i18n": "8.27.1",
     "vue-multipane": "^0.9.5",