.readthedocs.yaml: modernize this

.readthedocs.yaml

@@ -0,0 +1,16 @@
+version: 2
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.10"
+
+sphinx:
+  configuration: docs/conf.py
+
+python:
+  install:
+  - method: pip
+    path: .
+    extra_requirements:
+    - docs

.readthedocs.yml

@@ -1,15 +0,0 @@
-version: 2
-
-build:
-  image: latest
-
-python:
-  version: 3.7
-  install:
-    - method: pip
-      path: .
-      extra_requirements:
-        - docs
-
-# Don't build any extra formats
-formats: []