Adding unshallow git stamp (#220)

Author: HarshithaPrabhuswamy

.readthedocs.yaml

@@ -11,6 +11,10 @@ build:
   tools:
     python: "3.10"
 
+  jobs:
+    post_checkout:
+      - git fetch --unshallow || true
+
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
    configuration: docs/conf.py