[glib] update to 2.86.4

[AenBleidd]

• 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]

Pull request overview

Updates the glib port from version 2.86.3 to 2.86.4, including updated SHA512 checksum for the new source archive.

Changes:

• Updated glib version to 2.86.4
• Updated SHA512 checksum for the new source tarball
• Added new version entry to the version database

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
ports/glib/vcpkg.json	Updated version field to 2.86.4
ports/glib/portfile.cmake	Updated SHA512 checksum for the 2.86.4 source archive
versions/g-/glib.json	Added new version entry for 2.86.4 with git-tree hash
versions/baseline.json	Updated baseline version to 2.86.4

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