Bump xml-crypto from 3.2.0 to 3.2.1 in /ec-sri-invoice-signer (#43)

Bumps [xml-crypto](https://github.com/node-saml/xml-crypto) from 3.2.0 to 3.2.1.
- [Release notes](https://github.com/node-saml/xml-crypto/releases)
- [Changelog](https://github.com/node-saml/xml-crypto/blob/master/CHANGELOG.md)
- [Commits](node-saml/xml-crypto@v3.2.0...v3.2.1)

---
updated-dependencies:
- dependency-name: xml-crypto
  dependency-type: indirect
...

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Author: dependabot[bot]