fix: #6800, graphql parallel queries with different fallback locales (#8140)

## Description

Fixes #6800 where parallel GraphQL queries with different locales /
fallbackLocales do not return their data properly.

Author: jmikrut

packages/payload/src/collections/dataloader.ts

@@ -136,8 +136,8 @@ const batchAndLoadDocs =
           depth,
           docID: doc.id,
           draft,
-          fallbackLocale: req.fallbackLocale,
-          locale: req.locale,
+          fallbackLocale,
+          locale,
           overrideAccess,
           showHiddenFields,
           transactionID: req.transactionID,