Build documentation on Python 3.14 (#1173)

Author: adamchainz

.readthedocs.yaml

@@ -7,7 +7,7 @@ version: 2
 build:
   os: ubuntu-24.04
   tools:
-    python: "3.13"
+    python: "3.14"
   jobs:
     pre_create_environment:
        - asdf plugin add uv