Bump ajv from 8.17.1 to 8.18.0 in /extensions/ql-vscode

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](ajv-validator/ajv@v8.17.1...v8.18.0)

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

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

Author: dependabot[bot]

extensions/ql-vscode/package-lock.json

@@ -2069,7 +2069,7 @@
     "@vscode/codicons": "^0.0.44",
     "@vscode/debugadapter": "^1.59.0",
     "@vscode/debugprotocol": "^1.68.0",
-    "ajv": "^8.17.1",
+    "ajv": "^8.18.0",
     "chokidar": "^3.6.0",
     "d3": "^7.9.0",
     "d3-graphviz": "^5.6.0",