ci(cardano-node): fix moog download for 0.5.x musl packaging
The latest moog release dropped the moog-*-linux64.tar.gz asset; the portable Linux binary is now the statically-linked moog-*-x86_64-linux-musl.tar.gz. Replace the get-latest-release + release-downloader actions with a gh release download that picks the right asset, fixing the failing Install moog step.