fix: use native uv support in .readthedocs.yaml

requirements/doc.txt was deleted as part of the uv migration.
RTD added native uv support in April 2026, so use method: uv
with command: sync and the doc dependency group instead of
the old requirements file approach.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: salman2013

.readthedocs.yaml

@@ -21,7 +21,9 @@ build:
   tools:
     python: "3.12"
 
-# Optionally set the version of Python and requirements required to build your docs
 python:
   install:
-  - requirements: requirements/doc.txt
+    - method: uv
+      command: sync
+      groups:
+        - doc