Pull Request #62 Bump testfixtures from 4.7.0 to 6.16.0

Bumps [testfixtures](https://github.com/Simplistix/testfixtures) from 4.7.0 to 6.16.0.
- [Release notes](https://github.com/Simplistix/testfixtures/releases)
- [Changelog](https://github.com/Simplistix/testfixtures/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/Simplistix/testfixtures/compare/4.7.0...6.16.0)

Signed-off-by: dependabot[bot] <support@github.com>

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