readthedocs: Fix builds

Signed-off-by: Stephen Finucane <stephen@that.guru>

Author: stephenfin

.readthedocs.yaml

@@ -1,14 +1,15 @@
 ---
 version: 2
+sphinx:
+  builder: "dirhtml"
+  configuration: docs/conf.py
 python:
   install:
     - requirements: docs/requirements.txt
-sphinx:
-  builder: "dirhtml"
 build:
-  os: "ubuntu-22.04"
+  os: "ubuntu-24.04"
   tools:
-    python: "3.11"
+    python: "3.14"
   jobs:
     post_checkout:
       - git fetch --unshallow