Update vue monorepo to v2.7.15

Author: renovate[bot]

package-lock.json

@@ -53,9 +53,9 @@
     "jest": "26.6.3",
     "lodash": "4.17.21",
     "rimraf": "3.0.2",
-    "vue": "2.6.14",
+    "vue": "2.7.15",
     "vue-axios": "3.2.5",
-    "vue-template-compiler": "2.6.14",
+    "vue-template-compiler": "2.7.15",
     "vuex": "3.6.2",
     "webpack": "5.89.0",
     "webpack-cli": "4.10.0",