[boinc] update to 8.2.9

[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 boinc vcpkg port to version 8.2.9, aligning the port’s manifest, version database entry, and baseline to the new release.

Changes:

• Bump ports/boinc manifest version from 8.2.8 to 8.2.9.
• Update the portfile’s vcpkg_from_github() SHA512 for the 8.2.9 source ref.
• Add the 8.2.9 entry to the versions database and advance the repo baseline for boinc.

Reviewed changes

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

File	Description
versions/baseline.json	Advances boinc baseline to 8.2.9.
versions/b-/boinc.json	Adds a new 8.2.9 version entry with the corresponding git-tree.
ports/boinc/vcpkg.json	Updates the port version field to 8.2.9.
ports/boinc/portfile.cmake	Updates the source archive SHA512 for the 8.2.9 ref.

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