**Noteworthy changes in version 2.5.6** (2023-06-19)
* Fix logging of confidential data. [rA0fc31770fa]
* Fix memory wiping. [T5977]
* Fix macOS build problem. [T5440,T5610]
* Upgrade autoconf stuff.
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Note that this release has been done from the LIBASSUAN-2.5-BRANCH
(prev: T5354 next: T7028)