Bump vue-template-compiler from 2.5.20 to 2.5.21 in /apps/accessibility

Bumps [vue-template-compiler](https://github.com/vuejs/vue) from 2.5.20 to 2.5.21.
- [Release notes](https://github.com/vuejs/vue/releases)
- [Commits](https://github.com/vuejs/vue/compare/v2.5.20...v2.5.21)

Signed-off-by: dependabot[bot] <support@dependabot.com>

apps/accessibility/package-lock.json

@@ -2538,7 +2538,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -2953,7 +2954,8 @@
         "safe-buffer": {
           "version": "5.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -3009,6 +3011,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -3052,12 +3055,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -5642,9 +5647,9 @@
       }
     },
     "vue-template-compiler": {
-      "version": "2.5.20",
-      "resolved": "https://registry.npmjs.org/vue-template-compiler/-/vue-template-compiler-2.5.20.tgz",
-      "integrity": "sha512-aGJRLd1bJZi6oerGwCQVaDqvQ1T3dhCbNg9C2gNwzoKnyA3BmYfAWy8OQ3OhOebTri8o4YcLeXfwOOxtOKFfmA==",
+      "version": "2.5.21",
+      "resolved": "https://registry.npmjs.org/vue-template-compiler/-/vue-template-compiler-2.5.21.tgz",
+      "integrity": "sha512-Vmk5Cv7UcmI99B9nXJEkaK262IQNnHp5rJYo+EwYpe2epTAXqcVyExhV6pk8jTkxQK2vRc8v8KmZBAwdmUZvvw==",
       "dev": true,
       "requires": {
         "de-indent": "^1.0.2",

apps/accessibility/package.json

@@ -25,7 +25,7 @@
 		"css-loader": "^2.0.0",
 		"file-loader": "^1.1.11",
 		"vue-loader": "^15.4.2",
-		"vue-template-compiler": "^2.5.20",
+		"vue-template-compiler": "^2.5.21",
 		"webpack": "^4.27.1",
 		"webpack-cli": "^3.1.2",
 		"webpack-merge": "^4.1.5"