fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-JQUERY-565129

Author: snyk-bot

package.json

@@ -45,7 +45,7 @@
     "uglify-save-license": "0.4.1"
   },
   "dependencies": {
-    "jquery": "3.4.1",
+    "jquery": "3.5.0",
     "jquery-ui-dist": "1.12.1",
     "prismjs": "1.20.0",
     "scrollspy-js": "0.1.3"