Update RTD config to fix Pixi

VeckoTheGecko · VeckoTheGecko · commit c2f50ce39b7c · 2025-09-28T16:20:03.000+02:00
Seems like xdggs also ran into this problem. Copying their fix to here
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
@@ -1,6 +1,9 @@
 version: 2
 build:
   os: ubuntu-lts-latest
+  tools:
+    # just so RTD stops complaining
+    python: "latest"
   jobs:
     create_environment:
       - asdf plugin add pixi
