Bump jquery from 2.1.4 to 3.5.0 in /frontend

Bumps [jquery](https://github.com/jquery/jquery) from 2.1.4 to 3.5.0.
- [Release notes](https://github.com/jquery/jquery/releases)
- [Changelog](https://github.com/jquery/jquery/blob/main/changelog.md)
- [Commits](jquery/jquery@2.1.4...3.5.0)

---
updated-dependencies:
- dependency-name: jquery
  dependency-type: direct:development
...

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

frontend/package.json

@@ -13,7 +13,7 @@
     "grunt-contrib-watch": "^0.6.1",
     "grunt-json-generator": "^0.1.0",
     "grunt-multi-lang-site-generator": "^0.6.0",
-    "jquery": "~2.1.4",
+    "jquery": "~3.5.0",
     "js-cookie": "2.1.3",
     "jwt-decode": "~1.4.0"
   }

frontend/yarn.lock

@@ -784,10 +784,10 @@ isobject@^3.0.0, isobject@^3.0.1:
   resolved "https://registry.yarnpkg.com/isobject/-/isobject-3.0.1.tgz#4e431e92b11a9731636aa1f9c8d1ccbcfdab78df"
   integrity sha1-TkMekrEalzFjaqH5yNHMvP2reN8=
 
-jquery@~2.1.4:
-  version "2.1.4"
-  resolved "https://registry.yarnpkg.com/jquery/-/jquery-2.1.4.tgz#228bde698a0c61431dc2630a6a154f15890d2317"
-  integrity sha1-IoveaYoMYUMdwmMKahVPFYkNIxc=
+jquery@~3.5.0:
+  version "3.5.0"
+  resolved "https://registry.yarnpkg.com/jquery/-/jquery-3.5.0.tgz#9980b97d9e4194611c36530e7dc46a58d7340fc9"
+  integrity sha512-Xb7SVYMvygPxbFMpTFQiHh1J7HClEaThguL15N/Gg37Lri/qKyhRGZYzHRyLH8Stq3Aow0LsHO2O2ci86fCrNQ==
 
 js-cookie@2.1.3:
   version "2.1.3"