bump highlight.js from 11.8.0 to 11.9.0 (#908)

---
updated-dependencies:
- dependency-name: highlight.js
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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package.json

@@ -45,7 +45,7 @@
  "gatsby-transformer-asciidoc": "^4.12.0",
  "gatsby-transformer-remark": "^6.12.0",
  "gatsby-transformer-sharp": "^5.12.0",
- "highlight.js": "^11.8.0",
+ "highlight.js": "^11.9.0",
  "html-to-text": "^9.0.5",
  "i18next": "^21.10.0",
  "iso-639-1": "^2.1.15",