Bump illuminate/database from 6.1.0 to 6.15.0

Bumps [illuminate/database](https://github.com/illuminate/database) from 6.1.0 to 6.15.0.
- [Release notes](https://github.com/illuminate/database/releases)
- [Commits](illuminate/database@v6.1.0...v6.15.0)

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