Update .readthedocs.yaml

Author: vidartf

.readthedocs.yaml

@@ -3,7 +3,7 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.10"
-      nodejs: "18"
+    nodejs: "18"
   jobs:
     pre_install:
       # pip install is now not in-place, so we need to manually ensure autogen gets run