Release v6.2.0

This release introduces a new method and improves the atomicity of an existing one, along with a bug fix.

New Features

• Added setdefault_with method to cache classes for more flexible atomic operations.

Changes

• setdefault is now fully atomic, improving thread-safety and reliability.

Bug Fixes

• #61: Cache stampede doesn't work in free threading

Thanks To

• @ddorian for the issue.