build(deps): bump prismjs from 1.25.0 to 1.28.0 in /frontend

Bumps [prismjs](https://github.com/PrismJS/prism) from 1.25.0 to 1.28.0.
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.25.0...v1.28.0)

---
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]

frontend/package-lock.json

@@ -54,6 +54,6 @@
     "chartist": "^0.11.3",
     "mustache": "^4.2.0",
     "normalize.css": "^8.0.1",
-    "prismjs": "^1.25.0"
+    "prismjs": "^1.28.0"
   }
 }