Wait 50ms before exit to fix libuv bug (#689)

Fixes: #686

dist/setup/index.js

@@ -96091,6 +96091,8 @@ async function run() {
         if (inputs_1.enableCache) {
             await (0, restore_cache_1.restoreCache)();
         }
+        // https://github.com/nodejs/node/issues/56645#issuecomment-3077594952
+        await new Promise((resolve) => setTimeout(resolve, 50));
         process.exit(0);
     }
     catch (err) {