tools: use shasum instead of sha256sum

By default, there is no sha256sum command in macOS.

PR-URL: nodejs#48229
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

tools/dep_updaters/utils.sh

@@ -13,11 +13,11 @@ log_and_verify_sha256sum() {
   package_name="$1"
   archive="$2"
   checksum="$3"
-  bsd_formatted_checksum=$(sha256sum --tag "$archive")
+  bsd_formatted_checksum=$(shasum -a 256 --tag "$archive")
   if [ -z "$3" ]; then
     echo "$bsd_formatted_checksum"
   else
-    archive_checksum=$(sha256sum "$archive")
+    archive_checksum=$(shasum -a 256 "$archive")
     if [ "$checksum" = "$archive_checksum" ]; then
       echo "Valid $package_name checksum"
       echo "$bsd_formatted_checksum"