Bump d3-graphviz from 5.2.0 to 5.6.0 in /extensions/ql-vscode

Bumps [d3-graphviz](https://github.com/magjac/d3-graphviz) from 5.2.0 to 5.6.0.
- [Release notes](https://github.com/magjac/d3-graphviz/releases)
- [Changelog](https://github.com/magjac/d3-graphviz/blob/master/CHANGELOG.md)
- [Commits](magjac/d3-graphviz@v5.2.0...v5.6.0)

---
updated-dependencies:
- dependency-name: d3-graphviz
  dependency-version: 5.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

extensions/ql-vscode/package-lock.json

@@ -2072,7 +2072,7 @@
     "ajv": "^8.11.0",
     "chokidar": "^3.6.0",
     "d3": "^7.9.0",
-    "d3-graphviz": "^5.0.2",
+    "d3-graphviz": "^5.6.0",
     "fs-extra": "^11.1.1",
     "js-yaml": "^4.1.1",
     "koffi": "^2.12.0",