refactor: improve typing in backend (#748)

apps/server/src/controllers/projectController.validate.ts

@@ -1,4 +1,5 @@
 import { body, validationResult } from 'express-validator';
+import { Request, Response, NextFunction } from 'express';
 
 export const projectSanitiser = [
   body('title').optional().isString().trim(),
@@ -8,7 +9,8 @@ export const projectSanitiser = [
   body('backstageUrl').optional().isString().trim(),
   body('backstageInfo').optional().isString().trim(),
   body('endMessage').optional().isString().trim(),
-  (req, res, next) => {
+
+  (req: Request, res: Response, next: NextFunction) => {
     const errors = validationResult(req);
     if (!errors.isEmpty()) return res.status(422).json({ errors: errors.array() });
     next();