[libheif] Update to 1.23.6

[Torusrxxx (torusrxxx)]

• Changes comply with the maintainer guide.
• SHA512s are updated for each updated download.
• The "supports" clause reflects platforms that may be fixed by this new version, or no changes were necessary.
• Any fixed CI baseline and CI feature baseline entries are removed from that file, or no entries needed to be changed.
• All patch files in the port are applied and succeed.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Exactly one version is added in each modified versions file.

[Copilot]

Copilot review overview

🟡 Changes recommended

The vvdec integration has incorrect dependency discovery/export handling and inaccurate license metadata.

Review effort: Balanced
Findings: 1 · 1 · 2

Open (4)

• Add conditional vvdec dependency to the installed package config · New
• Lowercase vvdec package name required for dependency discovery · New
• Incorrectly advertises dav1d as an AV1 encoder · New
• Use the dependency's exact SPDX license identifier · New

What changed in this PR

Updates libheif to 1.23.6 and adds configurable decoder features.

Changes:

• Updates source and version metadata.
• Adds dav1d, libde265, and vvdec features.
• Maps the new features to upstream CMake options.

CI was still running; review used source and configuration inspection.

File	Description
versions/​l-/​libheif.json	Adds version 1.23.6.
versions/​baseline.json	Updates the baseline version.
ports/​libheif/​vcpkg.json	Defines codec features and dependencies.
ports/​libheif/​portfile.cmake	Configures the new upstream codec options.

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[Torusrxxx (torusrxxx)]

Waiting for kvazaar port (#54176) before changing the default HEVC encoder from x265 to kvazaar for permissive license.

[Billy O'Neal (BillyONeal)]

Waiting for kvazaar port (#54176) before changing the default HEVC encoder from x265 to kvazaar for permissive license.

That's now merged :)