Release v3.1.6

This patch fixes an issue where creating budgets for child categories under the same parent causes an error. I've also included some dependency upgrades to address security vulnerabilities.

What's Changed

• Cherry pick changes for patch by @teelur in https://github.com/teelur/budget-board/pull/706

Full Changelog: https://github.com/teelur/budget-board/compare/v3.1.5...v3.1.6