fix: upgrade highlight.js from 9.12.0 to 9.18.1
fix: upgrade highlight.js from 9.12.0 to 9.18.1

Snyk has created this PR to upgrade highlight.js from 9.12.0 to 9.18.1.

See this package in NPM:
https://www.npmjs.com/package/highlight.js

See this project in Snyk:
https://app.snyk.io/org/kfiku/project/19feaffa-f135-4eac-bdb1-e9dd6f2cb997?utm_source=github&utm_medium=upgrade-pr
kfiku/piGit,kfiku/piGit,kfiku/piGit