chore(composer.lock): update monolog/monolog (3.8.1 => 3.9.0)

Lock file operations: 0 installs, 1 update, 0 removals
- Upgrading monolog/monolog (3.8.1 => 3.9.0)

monolog/monolog updated from 3.8.1 to 3.9.0 minor
- See changes: https://github.com/Seldaek/monolog/compare/3.8.1...3.9.0
- Release notes: https://github.com/Seldaek/monolog/releases/tag/3.9.0