fix: upgrade diff2html from 2.4.0 to 2.12.2
fix: upgrade diff2html from 2.4.0 to 2.12.2

Snyk has created this PR to upgrade diff2html from 2.4.0 to 2.12.2.

See this package in NPM:
https://www.npmjs.com/package/diff2html

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