Bump mysql2 from 0.5.2 to 0.5.3
Bump mysql2 from 0.5.2 to 0.5.3

Bumps [mysql2](https://github.com/brianmario/mysql2) from 0.5.2 to 0.5.3.
- [Release notes](https://github.com/brianmario/mysql2/releases)
- [Commits](https://github.com/brianmario/mysql2/compare/0.5.2...0.5.3)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
alphagov/signonotron2,alphagov/signonotron2,alphagov/signonotron2,alphagov/signonotron2