Prepare to release version v26.6.1

[github-actions]

Update the version number for releasing the latest version of Quark.
In this version, the following changes will be included.

• Add Hydra malware family analysis report ev-flow/quark-engine#892
• Fix annotation of quark.utils.tools.contains ev-flow/quark-engine#885
• Incorrect namings of CAST_TYPE instructions in PyEval.eval ev-flow/quark-engine#871
• Fix #871: Fix instruction names for PyEval.CAST_TYPE ev-flow/quark-engine#872
• Fix #887: Update smoke test CI with new behavior counts ev-flow/quark-engine#888
• Add an AI issue solver workflow to help solving issues ev-flow/quark-engine#875
• Bump pip from 25.3 to 26.0 ev-flow/quark-engine#862
• Bump flask from 2.2.5 to 3.1.3 ev-flow/quark-engine#865
• Bump werkzeug from 3.1.5 to 3.1.6 ev-flow/quark-engine#883
• Process invoke-polymorphic instructions in AndroguardImp.get_method_bytecode ev-flow/quark-engine#874