Apply latest ReadTheDoc config rules

Issue-ID: CPS-1757
Signed-off-by: ToineSiebelink <toine.siebelink@est.tech>
Change-Id: I3af4d9224e5908021f323285bc3c0dca6e6f0ac2
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 9c22c0b..963cdf7 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,5 +1,5 @@
 #  ============LICENSE_START=======================================================
-#  Copyright (C) 2021 Nordix Foundation
+#  Copyright (C) 2021-2023 Nordix Foundation
 #  ================================================================================
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -23,16 +23,14 @@
 # Required
 version: 2
 
-formats:
-  - htmlzip
-
 build:
-  image: latest
+  os: ubuntu-20.04
+  tools:
+    python: "3.8"
 
 python:
-  version: 3.7
   install:
-    - requirements: docs/requirements-docs.txt
+  - requirements: docs/requirements-docs.txt
 
 sphinx:
   configuration: docs/conf.py