Bump pyexcel-xlsx from 0.5.5 to 0.5.6
Bump pyexcel-xlsx from 0.5.5 to 0.5.6

Bumps [pyexcel-xlsx](https://github.com/pyexcel/pyexcel-xlsx) from 0.5.5 to 0.5.6.
- [Release notes](https://github.com/pyexcel/pyexcel-xlsx/releases)
- [Changelog](https://github.com/pyexcel/pyexcel-xlsx/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pyexcel/pyexcel-xlsx/compare/v0.5.5...v0.5.6)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
rloomans/measure-mate,rloomans/measure-mate,rloomans/measure-mate,rloomans/measure-mate