Bump orchestra/testbench from 6.11.0 to 6.13.0

Bumps [orchestra/testbench](https://github.com/orchestral/testbench) from 6.11.0 to 6.13.0.
- [Release notes](https://github.com/orchestral/testbench/releases)
- [Changelog](https://github.com/orchestral/testbench/blob/6.x/CHANGELOG-6.x.md)
- [Commits](orchestral/testbench@v6.11.0...v6.13.0)

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Author: dependabot[bot]