Try yet again??

No idea why RTD seems to say:

    Problem in your project's configuration. Invalid "build.tools.python":
    .readthedocs.yml: Invalid configuration option: build.tools.python.

but let's hope it's some very very very specific hope that the file is called
.yaml now??

.readthedocs.yml → .readthedocs.yaml

@@ -1,6 +1,7 @@
 version: 2
 
 build:
+  os: ubuntu-22.04
   apt_packages:
     - inkscape
   tools: