Add aarch64-linux to native platforms

Author: fcatuhe

lib/litestream/upstream.rb

@@ -4,6 +4,7 @@ module Upstream
 
     # rubygems platform name => upstream release filename
     NATIVE_PLATFORMS = {
+      "aarch64-linux" => "litestream-#{VERSION}-linux-arm64.tar.gz",
       "arm64-darwin" => "litestream-#{VERSION}-darwin-arm64.zip",
       "arm64-linux" => "litestream-#{VERSION}-linux-arm64.tar.gz",
       "x86_64-darwin" => "litestream-#{VERSION}-darwin-amd64.zip",