Optimize async middleware

Avoid using bluebird, a simple for/await is enought

server/core/middlewares/async.ts

@@ -1,4 +1,3 @@
-import Bluebird from 'bluebird'
 import { NextFunction, Request, RequestHandler, Response } from 'express'
 import { ValidationChain } from 'express-validator'
 import { ExpressPromiseHandler } from '@server/types/express-handler.js'
@@ -9,22 +8,27 @@ import { retryTransactionWrapper } from '../helpers/database-utils.js'
 export type RequestPromiseHandler = ValidationChain | ExpressPromiseHandler
 
 function asyncMiddleware (fun: RequestPromiseHandler | RequestPromiseHandler[]) {
-  return (req: Request, res: Response, next: NextFunction) => {
-    if (Array.isArray(fun) === true) {
-      return Bluebird.each(fun as RequestPromiseHandler[], f => {
-        return new Promise<void>((resolve, reject) => {
+  return async (req: Request, res: Response, next: NextFunction) => {
+    if (Array.isArray(fun) !== true) {
+      return Promise.resolve((fun as RequestHandler)(req, res, next))
+        .catch(err => next(err))
+    }
+
+    try {
+      for (const f of (fun as RequestPromiseHandler[])) {
+        await new Promise<void>((resolve, reject) => {
           return asyncMiddleware(f)(req, res, err => {
             if (err) return reject(err)
 
             return resolve()
           })
         })
-      }).then(() => next())
-        .catch(err => next(err))
-    }
+      }
 
-    return Promise.resolve((fun as RequestHandler)(req, res, next))
-      .catch(err => next(err))
+      next()
+    } catch (err) {
+      next(err)
+    }
   }
 }