Update readthedocs config

Issue-ID: NONRTRIC-921
Change-Id: Iea905f410d2dd0bd412a9f9ca00e7f4af612dce2
Signed-off-by: ktimoney <kevin.timoney@est.tech>
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 7f0136e..311a67c 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -1,5 +1,5 @@
 #  ============LICENSE_START===============================================
-#  Copyright (C) 2020-2022 Nordix Foundation. All rights reserved.
+#  Copyright (C) 2020-2023 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
diff --git a/Dockerfile b/Dockerfile
index bf64aae..b37fee1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 #  ============LICENSE_START===============================================
-#  Copyright (C) 2020 Nordix Foundation. All rights reserved.
+#  Copyright (C) 2020-2023 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.
@@ -18,10 +18,10 @@
 FROM curlimages/curl:7.78.0 AS base-build
 
 #Get helm
-RUN curl -Lo /tmp/helm.tar.gz  https://get.helm.sh/helm-v3.6.1-linux-amd64.tar.gz
+RUN wget -O /tmp/helm.tar.gz https://nexus.o-ran-sc.org/content/repositories/helm/helm-v3.6.1-linux-amd64.tar.gz
 
 #Get kubectl
-RUN curl -Lo /tmp/kubectl  https://dl.k8s.io/release/v1.20.2/bin/linux/amd64/kubectl
+RUN wget -O /tmp/kubectl https://nexus.o-ran-sc.org/content/repositories/kubectl/v1.20.2/bin/linux/amd64/kubectl
 
 #Get JDK & shrink it to equivalent to a JRE
 FROM openjdk:17-jdk as jre-build
diff --git a/docs/index.rst b/docs/index.rst
index b39f8ae..cd8f64f 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -1,6 +1,6 @@
 .. This work is licensed under a Creative Commons Attribution 4.0 International License.
 .. SPDX-License-Identifier: CC-BY-4.0
-.. Copyright (C) 2021 Nordix
+.. Copyright (C) 2021-2023 Nordix
 
 Non-RT RIC Helm Manager
 =======================