Update readthedocs configuration file

Signed-off-by: Ajay Bhargav <[email protected]>

.readthedocs.yaml

@@ -5,16 +5,22 @@
 # Required
 version: 2
 
+# Set the OS, Python version and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
+
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
    configuration: docs/conf.py
 
 # Optionally build your docs in additional formats such as PDF
 formats:
    - pdf
+   - epub
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-   version: 3.7
    install:
    - requirements: docs/requirements.txt