Bump vue and vue-template-compiler

Bumps [vue](https://github.com/vuejs/vue) and [vue-template-compiler](https://github.com/vuejs/vue). These dependencies needed to be updated together.

Updates `vue` from 2.6.11 to 2.6.12
- [Release notes](https://github.com/vuejs/vue/releases)
- [Commits](vuejs/vue@v2.6.11...v2.6.12)

Updates `vue-template-compiler` from 2.6.11 to 2.6.12
- [Release notes](https://github.com/vuejs/vue/releases)
- [Commits](vuejs/vue@v2.6.11...v2.6.12)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: npmbuildbot[bot] <npmbuildbot[bot]@users.noreply.github.com>

package.json

@@ -30,7 +30,7 @@
     "@nextcloud/vue-dashboard": "^0.1.6",
     "babel-eslint": "^10.1.0",
     "nextcloud-server": "^0.15.10",
-    "vue": "^2.6.11",
+    "vue": "^2.6.12",
     "vuex": "^3.5.1"
   },
   "devDependencies": {
@@ -57,7 +57,7 @@
     "stylelint-scss": "^3.18.0",
     "stylelint-webpack-plugin": "^2.1.0",
     "vue-loader": "^15.9.3",
-    "vue-template-compiler": "^2.6.11",
+    "vue-template-compiler": "^2.6.12",
     "webpack": "^4.44.1",
     "webpack-cli": "^3.3.12",
     "webpack-merge": "^5.1.1"