Bump jquery-validation from 1.19.3 to 1.19.4 in /gui/admin-gui

Bumps [jquery-validation](https://github.com/jquery-validation/jquery-validation) from 1.19.3 to 1.19.4.
- [Release notes](https://github.com/jquery-validation/jquery-validation/releases)
- [Changelog](https://github.com/jquery-validation/jquery-validation/blob/master/changelog.md)
- [Commits](jquery-validation/jquery-validation@1.19.3...1.19.4)

---
updated-dependencies:
- dependency-name: jquery-validation
  dependency-type: indirect
...

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