chore: update frontend build for v1.1.81 [skip ci]

web/admin-spa/node_modules/postcss-js/async.js

@@ -0,0 +1,15 @@
+let postcss = require('postcss')
+
+let processResult = require('./process-result')
+let parse = require('./parser')
+
+module.exports = function async(plugins) {
+  let processor = postcss(plugins)
+  return async input => {
+    let result = await processor.process(input, {
+      parser: parse,
+      from: undefined
+    })
+    return processResult(result)
+  }
+}