fix curl call on Windows

action.yml

@@ -79,6 +79,7 @@ runs:
             macOS)
               app_home="$RUNNER_TEMP/yq"
               app_target_bin=yq
+              null_file=/dev/null
               case "$(machine)" in
                 *arm*) app_source_bin='yq_darwin_arm64' ;;
                     *) app_source_bin='yq_darwin_amd64' ;;
@@ -87,6 +88,7 @@ runs:
             Linux)
               app_home="$RUNNER_TEMP/yq"
               app_target_bin=yq
+              null_file=/dev/null
               case $(uname -m) in # https://stackoverflow.com/questions/45125516/possible-values-for-uname-m
                      i386|i686) app_source_bin='yq_linux_386' ;;
                         x86_64) app_source_bin='yq_linux_amd64' ;;
@@ -98,6 +100,7 @@ runs:
               app_home="$(cygpath "$RUNNER_TEMP")/yq"
               app_target_bin=yq.exe
               app_source_bin='yq_windows_amd64.exe'
+              null_file=nul
               ;;
           esac
         
@@ -106,7 +109,7 @@ runs:
           echo "app_target_bin: $app_target_bin"
         
           function get_latest_version() {
-            (set -x; curl -sSfL --max-time 5 -o /dev/null -w '%{url_effective}' $APP_REPO_ROOT/releases/latest | grep -o '[^/]*$' | cut -c2-)
+            (set -x; curl -sSfL --max-time 5 -o $null_file -w '%{url_effective}' $APP_REPO_ROOT/releases/latest | grep -o '[^/]*$' | cut -c2-)
           }
         
           app_downloaded=false