Bump sweetalert2 from 9.10.12 to 9.15.2 in /app

Bumps [sweetalert2](https://github.com/sweetalert2/sweetalert2) from 9.10.12 to 9.15.2.
- [Release notes](https://github.com/sweetalert2/sweetalert2/releases)
- [Changelog](https://github.com/sweetalert2/sweetalert2/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sweetalert2/sweetalert2/compare/v9.10.12...v9.15.2)

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

app/package.json

@@ -61,7 +61,7 @@
         "lodash": "^4.17.15",
         "materialize-css": "git://github.com/cutls/materialize#v1-dev",
         "sumchecker": "^3.0.1",
-        "sweetalert2": "^9.10.12",
+        "sweetalert2": "^9.15.2",
         "system-font-families": "^0.4.1",
         "vue": "^2.6.11"
     },

app/yarn.lock

@@ -2840,10 +2840,10 @@ supports-color@^7.1.0:
   dependencies:
     has-flag "^4.0.0"
 
-sweetalert2@^9.10.12:
-  version "9.10.12"
-  resolved "https://registry.yarnpkg.com/sweetalert2/-/sweetalert2-9.10.12.tgz#e3752fcbe13e7d23d0f85ee84b3c5fdc923da552"
-  integrity sha512-RnarmbDGTPmwecJbaVdq5LvlzbVReIOtPk0huPnXOE19G00xMxGcTY0wjt9AjwsexUnLivLXc3b6nD6+D6NlGg==
+sweetalert2@^9.15.2:
+  version "9.15.2"
+  resolved "https://registry.yarnpkg.com/sweetalert2/-/sweetalert2-9.15.2.tgz#d26f1e6dee91d9ff57b3b98b3d92a0d6c3fa6fc1"
+  integrity sha512-evJfoa49s5ZzSmVc62tslNkzlQoCg2GHjB3MQxawfESppvY5AlXKLGQ3nNKxHXKdodKmIHbkl39DgUhcOK7LgQ==
 
 system-font-families@^0.4.1:
   version "0.4.1"