Bump Node 15.11.0 for automated tests (#7243)

Author: davimacedo

Diff for: .github/workflows/ci.yml

@@ -96,7 +96,7 @@ jobs:
             MONGODB_VERSION: 4.4.4
             MONGODB_TOPOLOGY: standalone
             MONGODB_STORAGE_ENGINE: wiredTiger
-            NODE_VERSION: 15.10.0
+            NODE_VERSION: 15.11.0
     name: ${{ matrix.name }}
     timeout-minutes: 30
     runs-on: ubuntu-18.04

Diff for: README.md

@@ -109,7 +109,7 @@ Parse Server is continuously tested with the most recent releases of Node.js to
 | Node.js 10 | 10.24.0              | April 2021       | ✅ Fully compatible |
 | Node.js 12 | 12.21.0              | April 2022       | ✅ Fully compatible |
 | Node.js 14 | 14.16.0              | April 2023       | ✅ Fully compatible |
-| Node.js 15 | 15.10.0               | June 2021        | ✅ Fully compatible |
+| Node.js 15 | 15.11.0               | June 2021        | ✅ Fully compatible |
 
 #### MongoDB
 Parse Server is continuously tested with the most recent releases of MongoDB to ensure compatibility. We follow the [MongoDB support schedule](https://www.mongodb.com/support-policy) and only test against versions that are officially supported and have not reached their end-of-life date.