build(deps): bump gpt-tokenizer from 2.9.0 to 3.4.0 in /server

Bumps [gpt-tokenizer](https://github.com/niieani/gpt-tokenizer) from 2.9.0 to 3.4.0.
- [Release notes](https://github.com/niieani/gpt-tokenizer/releases)
- [Commits](niieani/gpt-tokenizer@2.9.0...3.4.0)

---
updated-dependencies:
- dependency-name: gpt-tokenizer
  dependency-version: 3.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

server/package-lock.json

@@ -48,7 +48,7 @@
     "form-data": "^4.0.4",
     "fs-extra": "^10.0.0",
     "fuse.js": "^7.0.0",
-    "gpt-tokenizer": "^2.8.1",
+    "gpt-tokenizer": "^3.4.0",
     "helmet": "^4.1.1",
     "isomorphic-dompurify": "^1.9.0",
     "jose": "^4.15.5",