Bump jspdf from 3.0.2 to 4.0.0 in /client

Bumps [jspdf](https://github.com/parallax/jsPDF) from 3.0.2 to 4.0.0.
- [Release notes](https://github.com/parallax/jsPDF/releases)
- [Changelog](https://github.com/parallax/jsPDF/blob/master/RELEASE.md)
- [Commits](parallax/jsPDF@v3.0.2...v4.0.0)

---
updated-dependencies:
- dependency-name: jspdf
  dependency-version: 4.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

client/package.json

@@ -84,7 +84,7 @@
     "jquery-migrate": "~1.4",
     "jquery-mousewheel": "^3.1.13",
     "jquery-ui": "^1.13.2",
-    "jspdf": "^3.0.2",
+    "jspdf": "^4.0.0",
     "katex": "^0.16.22",
     "linkify-html": "^4.1.1",
     "linkifyjs": "^4.1.1",