fix(docs): specify python version to 3.10

The docs say 3 is valid, but it is not. Jammy uses 3.10 so pin it to
that.

Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
Change-Id: I73530750065294eb511d88318ba86a6c50c8aa7d
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index de171ae..99525b5 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -12,7 +12,7 @@
 build:
   os: ubuntu-22.04 # Ubuntu Jammy LTS
   tools:
-    python: 3
+    python: 3.10
 
 python:
   install: