build(deps): bump fast-xml-parser from 4.5.0 to 4.5.6 in /functions (#339)

Bumps [fast-xml-parser](https://github.com/NaturalIntelligence/fast-xml-parser) from 4.5.0 to 4.5.6.
- [Release notes](https://github.com/NaturalIntelligence/fast-xml-parser/releases)
- [Changelog](https://github.com/NaturalIntelligence/fast-xml-parser/blob/master/CHANGELOG.md)
- [Commits](NaturalIntelligence/fast-xml-parser@v4.5.0...v4.5.6)

---
updated-dependencies:
- dependency-name: fast-xml-parser
  dependency-version: 4.5.6
  dependency-type: indirect
...

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