v0.12.21

NEW FEATURES:

• backend/cos: New backend "cos", supporting using Tencent Cloud Storage as a remote backend.
• command/login: Enable "terraform login" and add support for UI-generated tokens (#23995)
• command/logout: Add "terraform logout" command to remove local credentials (#24048)

ENHANCEMENTS:

• command/workspace delete: release lock after workspace removal warning (#24085)
• lang/funcs: add setsubtract function (#23424)

BUG FIXES:

• command/state show: Fix an issue when a resource has a non-default provider configured (#24027)
• backend/remote-state: Fix issues where lingering lock files remained when deleting non-empty workspaces (#24085)
• command/import: Release lock if initialization error occurs on import (#23318)
• terraform: Fix panic when using for_each with a set containing null values (#24047)