Bump activerecord-nulldb-adapter from 0.5.0 to 0.5.1
Bump activerecord-nulldb-adapter from 0.5.0 to 0.5.1

Bumps [activerecord-nulldb-adapter](https://github.com/nulldb/nulldb) from 0.5.0 to 0.5.1.
- [Release notes](https://github.com/nulldb/nulldb/releases)
- [Changelog](https://github.com/nulldb/nulldb/blob/master/CHANGES.md)
- [Commits](https://github.com/nulldb/nulldb/commits/0.5.1)

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