fix: drop macOS-X64 support from the action's platform switch

release.yml no longer publishes x86_64-apple-darwin binaries (Intel
macOS releases were dropped), so keeping this case would 404 for any
release cut after that change.

Author: ptsouchlos

action.yml

@@ -53,7 +53,6 @@ runs:
         case "${RUNNER_OS}-${RUNNER_ARCH}" in
           Linux-X64)    TRIPLE=x86_64-unknown-linux-musl;  EXT=tar.gz ;;
           Linux-ARM64)  TRIPLE=aarch64-unknown-linux-musl; EXT=tar.gz ;;
-          macOS-X64)    TRIPLE=x86_64-apple-darwin;        EXT=tar.gz ;;
           macOS-ARM64)  TRIPLE=aarch64-apple-darwin;       EXT=tar.gz ;;
           Windows-X64)  TRIPLE=x86_64-pc-windows-msvc;     EXT=zip ;;
           *) echo "::error::Unsupported platform ${RUNNER_OS}-${RUNNER_ARCH}" >&2; exit 1 ;;