Bump jquery from 3.3.1 to 3.4.0 in /packages/rocketchat-livechat/.app

Bumps [jquery](https://github.com/jquery/jquery) from 3.3.1 to 3.4.0.
- [Release notes](https://github.com/jquery/jquery/releases)
- [Commits](jquery/jquery@3.3.1...3.4.0)

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

packages/rocketchat-livechat/.app/package.json

@@ -24,7 +24,7 @@
     "autolinker": "^1.8.1",
     "bcrypt": "^3.0.2",
     "core-js": "^2.5.7",
-    "jquery": "^3.3.1",
+    "jquery": "^3.4.0",
     "meteor-node-stubs": "^0.4.1",
     "mime-db": "^1.37.0",
     "mime-type": "^3.0.7",