Bump mnemosyne-ruby from 1.6.1 to 1.6.2
Bump mnemosyne-ruby from 1.6.1 to 1.6.2

Bumps [mnemosyne-ruby](https://github.com/jgraichen/mnemosyne-ruby) from 1.6.1 to 1.6.2.
- [Release notes](https://github.com/jgraichen/mnemosyne-ruby/releases)
- [Changelog](https://github.com/mnemosyne-mon/mnemosyne-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jgraichen/mnemosyne-ruby/compare/v1.6.1...v1.6.2)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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