Bump @clerk/backend from 1.34.0 to 2.3.1

Bumps [@clerk/backend](https://github.com/clerk/javascript/tree/HEAD/packages/backend) from 1.34.0 to 2.3.1.
- [Release notes](https://github.com/clerk/javascript/releases)
- [Changelog](https://github.com/clerk/javascript/blob/main/packages/backend/CHANGELOG.md)
- [Commits](https://github.com/clerk/javascript/commits/@clerk/backend@2.3.1/packages/backend)

---
updated-dependencies:
- dependency-name: "@clerk/backend"
  dependency-version: 2.3.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -24,7 +24,7 @@
   },
   "dependencies": {
     "@adviser/cement": "~0.4.14",
-    "@clerk/backend": "^1.25.8",
+    "@clerk/backend": "^2.3.1",
     "@clerk/clerk-js": "^5.58.1",
     "@clerk/clerk-react": "^5.25.5",
     "@fireproof/core": "^v0.21.0-dev-preview-7",