Update readthedocs config

Issue-ID: NONRTRIC-921
Change-Id: I9896c78b63d155b06021e767f67f7faf80a4f174
Signed-off-by: ktimoney <kevin.timoney@est.tech>
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 5970248..eb84485 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,5 +1,5 @@
 #  ============LICENSE_START===============================================
-#  Copyright (C) 2022 Nordix Foundation. All rights reserved.
+#  Copyright (C) 2022-2023 Nordix Foundation. All rights reserved.
 #  ========================================================================
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -22,12 +22,13 @@
   - htmlzip
 
 build:
-  image: latest
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
 
 python:
-  version: 3.7
   install:
-    - requirements: docs/requirements-docs.txt
+  - requirements: docs/requirements-docs.txt
 
 sphinx:
   configuration: docs/conf.py