chore(deps): bump linkify-it and mailparser in /apps/backend

Bumps [linkify-it](https://github.com/markdown-it/linkify-it) and [mailparser](https://github.com/nodemailer/mailparser). These dependencies needed to be updated together.

Updates `linkify-it` from 5.0.0 to 5.0.1
- [Changelog](https://github.com/markdown-it/linkify-it/blob/master/CHANGELOG.md)
- [Commits](markdown-it/linkify-it@5.0.0...5.0.1)

Updates `mailparser` from 3.6.7 to 3.9.12
- [Release notes](https://github.com/nodemailer/mailparser/releases)
- [Changelog](https://github.com/nodemailer/mailparser/blob/master/CHANGELOG.md)
- [Commits](nodemailer/mailparser@v3.6.7...v3.9.12)

---
updated-dependencies:
- dependency-name: linkify-it
  dependency-version: 5.0.1
  dependency-type: indirect
- dependency-name: mailparser
  dependency-version: 3.9.12
  dependency-type: indirect
...

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Author: dependabot[bot]