Bump robrichards/xmlseclibs from 3.0.1 to 3.0.4 in /libs/composer

Bumps [robrichards/xmlseclibs](https://github.com/robrichards/xmlseclibs) from 3.0.1 to 3.0.4.
- [Release notes](https://github.com/robrichards/xmlseclibs/releases)
- [Changelog](https://github.com/robrichards/xmlseclibs/blob/master/CHANGELOG.txt)
- [Commits](https://github.com/robrichards/xmlseclibs/compare/3.0.1...3.0.4

)

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