build(deps): bump github.com/russellhaering/goxmldsig

Bumps [github.com/russellhaering/goxmldsig](https://github.com/russellhaering/goxmldsig) from 1.5.0 to 1.6.0.
- [Release notes](https://github.com/russellhaering/goxmldsig/releases)
- [Commits](https://github.com/russellhaering/goxmldsig/compare/v1.5.0...v1.6.0)

---
updated-dependencies:
- dependency-name: github.com/russellhaering/goxmldsig
  dependency-version: 1.6.0
  dependency-type: indirect
...

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