Bump jquery from 3.2.1 to 3.4.0

Bumps [jquery](https://github.com/jquery/jquery) from 3.2.1 to 3.4.0.
- [Release notes](https://github.com/jquery/jquery/releases)
- [Commits](https://github.com/jquery/jquery/compare/3.2.1...3.4.0)

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

package.json

@@ -24,7 +24,7 @@
   },
   "homepage": "https://github.com/silverstripe/silverstripe-contentreview#readme",
   "dependencies": {
-    "jquery": "^3.2.1",
+    "jquery": "^3.4.0",
     "react": "15.3.1",
     "react-dom": "15.3.1",
     "react-redux": "^4.4.1",

yarn.lock

@@ -2393,9 +2393,9 @@ isstream@~0.1.2:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/isstream/-/isstream-0.1.2.tgz#47e63f7af55afa6f92e1500e690eb8b8529c099a"
 
-jquery@^3.2.1:
-  version "3.2.1"
-  resolved "https://registry.yarnpkg.com/jquery/-/jquery-3.2.1.tgz#5c4d9de652af6cd0a770154a631bba12b015c787"
+jquery@^3.4.0:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/jquery/-/jquery-3.4.0.tgz#8de513fa0fa4b2c7d2e48a530e26f0596936efdf"
 
 js-base64@^2.1.8, js-base64@^2.1.9:
   version "2.1.9"