Use .tar.xz extension for arm64 linux binary upload (#1287)

scripts/update_linux_arm64.sh

diff --git a/scripts/update_linux_arm64.sh b/scripts/update_linux_arm64.sh
index bddef74..4f78eff 100755
--- a/scripts/update_linux_arm64.sh
+++ b/scripts/update_linux_arm64.sh
@@ -17,7 +17,9 @@
 URL=$(jq -r '.Records[0] | "https://\(.s3.bucket.name).s3.\(.awsRegion).amazonaws.com/\(.s3.object.key)"')
 
 wget $URL -O arm64.tbz2
-gsutil cp -n arm64.tbz2 gs://webassembly/emscripten-releases-builds/linux/${SHA}/wasm-binaries-arm64.tbz2
+tar xf arm64.tbz2
+tar --use-compress-program "xz -T0" -cf arm64.tar.xz install/
+gsutil cp -n arm64.tar.xz gs://webassembly/emscripten-releases-builds/linux/${SHA}/wasm-binaries-arm64.tar.xz
 sed -i "s/\"latest-arm64-linux\": \".*\"/\"latest-arm64-linux\": \"$VERSION\"/" emscripten-releases-tags.json
 
 echo "done"