Log Message:
advancecomp: update to version 2.6

Changelog:

ADVANCECOMP VERSION 2.6 2023/10
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* Update libdeflate to 1.19 [Darik Horn]

ADVANCECOMP VERSION 2.5 2023/01
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* Fix segmentation fault on invalid MNG size

ADVANCECOMP VERSION 2.4 2022/11
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* Fix CVE-2022-35014, CVE-2022-35015, CVE-2022-35016, CVE-2022-35017,
  CVE-2022-35018, CVE-2022-35019, CVE-2022-35020
* Update libdeflate to 1.14

ADVANCECOMP VERSION 2.3 2022/04
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* Fix compatibility with modern C++ compilers.

ADVANCECOMP VERSION 2.2 2019/03
===============================

* Fixed multiple crash conditions with invalid PNG/MNG files.