community/kpmcore: Add run-time dependency lsblk

Used within kpmcore as an external command.

• https://invent.kde.org/system/kpmcore/-/blob/v23.08.4/src/fs/luks.cpp#L564-571
• https://invent.kde.org/system/kpmcore/-/blob/v23.08.4/src/plugins/sfdisk/sfdiskbackend.cpp#L74-80
• https://invent.kde.org/system/kpmcore/-/blob/v23.08.4/src/plugins/sfdisk/sfdiskbackend.cpp#L214-218
• https://invent.kde.org/system/kpmcore/-/blob/v23.08.4/src/plugins/sfdisk/sfdiskbackend.cpp#L264-265
• https://invent.kde.org/system/kpmcore/-/blob/v23.08.4/src/plugins/sfdisk/sfdiskbackend.cpp#L271-272
• https://invent.kde.org/system/kpmcore/-/blob/v23.08.4/src/util/helpers.cpp#L33-38