Bump ajv from 8.17.1 to 8.18.0

Bumps [ajv](https://github.com/ajv-validator/ajv) from 8.17.1 to 8.18.0.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](https://github.com/ajv-validator/ajv/compare/v8.17.1...v8.18.0)

---
updated-dependencies:
- dependency-name: ajv
  dependency-version: 8.18.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

packages/napcat-webui-backend/package.json

@@ -18,7 +18,7 @@
   "dependencies": {
     "@simplewebauthn/server": "^13.2.2",
     "@sinclair/typebox": "^0.34.38",
-    "ajv": "^8.13.0",
+    "ajv": "^8.18.0",
     "compressing": "^1.10.3",
     "compression": "^1.8.1",
     "express": "^5.0.0",