Revert to polkadot-sdk/cbab8ed4be1941420dd25dc81102fb79d8e2a7f0 (#2724)

* Revert to `cbab8ed4be1941420dd25dc81102fb79d8e2a7f0`

* Update lockfile

* Revert stabilization of `terminate_contract`

This reverts parts of commit d46acb5.

* Fix tests

Author: cmichi

CHANGELOG.md

@@ -12,7 +12,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 - Refactor contract ref generation and add automatic re-exporting ‒ [#2710](https://github.com/use-ink/ink/pull/2710)
-- Implement and stabilize `terminate_contract` ‒ [2708](https://github.com/use-ink/ink/pull/2708)
 
 ## Version 6.0.0-beta