build: update formatting settings to avoid deprecated tab replacement

[zimeg]

Type of change

• Bug fix

Summary

This PR updates formatting settings to avoid deprecated tab replacement:

Preview

Before changes:

$ gradle spotlessApply
'indentWithTabs' is deprecated, use 'leadingSpacesToTabs' in your gradle build script instead.

BUILD SUCCESSFUL in 501ms
7 actionable tasks: 2 executed, 5 up-to-date

After changes:

$ gradle spotlessApply

BUILD SUCCESSFUL in 451ms
7 actionable tasks: 2 executed, 5 up-to-date

Requirements

• I have ensured the changes I am contributing align with existing patterns and have tested and linted my code
• I've read and agree to the Code of Conduct