Docs: fix readthedocs build failure (2)

Provisionally fixes #248

readthedocs.yml

@@ -5,6 +5,12 @@
 # Required
 version: 2
 
+# Set the OS, Python version and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.10"
+
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: docs/conf.py
@@ -14,7 +20,7 @@ formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-   version: 3.6
+   version: 3.10
    install:
       - requirements: docs/requirements.txt
       - method: setuptools