Remove Doctrine\DBAL\Exception import, replace with \Throwable.

[herpaderpaldent]

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[what-the-diff]

PR Summary

• Dependency on Doctrine DBAL Removed
  We have removed the usage of the existing "doctrine/dbal": "^3.0" package from our treasure chest, me hearties. This makes our application less dependent on third-party packages and thus leaner and more self-sufficient.

• Updated Exception Type
  In the MigrateDb.php parchment, we've replaced the old exception type with the \Throwable type. This new exception type is more inclusive, able to catch more types of problems that might occur. We've also swept away the import statement for Doctrine\DBAL\Exception as it's no longer needed aboard our ship. This makes our error handling more efficient and flexible, ready to weather any storm.