[SunBlack (SunBlack)]

• 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]

🟢 Approval recommended

No active review issues are recorded for the libtcod 2.3.1 update, though builds and CI results were not independently verified.

No open issues 🎉

What changed in this PR

Updates the vcpkg libtcod port from 2.2.2 to 2.3.1 and synchronizes its version registry entries.

Changes:

• Updates the port version and source archive SHA512.
• Registers 2.3.1 and makes it the default baseline version.

Validation was limited to the supplied diffs; builds and CI results were not independently verified.

File	Description
versions/​l-/​libtcod.json	Adds the 2.3.1 version entry and port tree reference.
versions/​baseline.json	Sets the libtcod baseline to 2.3.1.
ports/​libtcod/​vcpkg.json	Updates the declared version to 2.3.1.
ports/​libtcod/​portfile.cmake	Updates the source archive SHA512 for the new release.

_{Review effort: Balanced}