Bump prismjs from 1.23.0 to 1.29.0

Bumps [prismjs](https://github.com/PrismJS/prism) from 1.23.0 to 1.29.0.
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.23.0...v1.29.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -33,7 +33,7 @@
     "gatsby-source-filesystem": "^3.10.0",
     "gatsby-transformer-sharp": "^3.1.0",
     "lodash": "^4.17.21",
-    "prismjs": "^1.23.0",
+    "prismjs": "^1.29.0",
     "prop-types": "^15.7.2",
     "react": "^17.0.1",
     "react-dom": "^17.0.1",