[Snyk] Upgrade diff2html from 3.4.35 to 3.4.39

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to upgrade diff2html from 3.4.35 to 3.4.39.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 4 versions ahead of your current version.
• The recommended version was released 21 days ago, on 2023-08-06.

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