[skip ci] Fix typo in wasi_vfs build name

Author: kateinoigakukun

lib/ruby_wasm/build/product/wasi_vfs.rb

@@ -39,7 +39,7 @@ def cli_bin_path
     end
 
     def name
-      "wasi-vfs-#{WASI_VFS_VERSION}-#{RbConfig::CONFIG["host"]}}"
+      "wasi-vfs-#{WASI_VFS_VERSION}-#{RbConfig::CONFIG["host"]}"
     end
 
     def build(executor)