Fixed RTD docs build issue with OpenSSL

Details:

* Fixed RTD docs build issue with OpenSSL by adding RTD config file that
  specifies Ubuntu 22.04 for the OS.

Signed-off-by: Andreas Maier <maiera@de.ibm.com>

.readthedocs.yaml

@@ -0,0 +1,24 @@
+# Read the Docs (RTD) configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# RTD config file version
+version: 2
+
+# Environment RTD sets up for the docs build
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: docs/conf.py
+
+# If using Sphinx, optionally build your docs in additional formats such as PDF
+# formats:
+#    - pdf
+
+# Python requirements required to build the docs
+python:
+   install:
+     - requirements: dev-requirements.txt

docs/changes.rst

@@ -72,6 +72,9 @@ Released: 2023-03-27
 
 * Test: Fixed test_info.py test that broke with new urllib3 version 2.0.2.
 
+* Fixed RTD docs build issue with OpenSSL by adding RTD config file that
+  specifies Ubuntu 22.04 for the OS.
+
 **Enhancements:**
 
 * Added missing environments to weekly full tests (Python 2.7,3.5,3.6 on Windows