Merge pull request #344 from GraphBLAS/stable

sync with stable

Author: DrTimothyAldenDavis

.readthedocs.yaml

@@ -2,13 +2,18 @@
 
 version: 2
 
-formats:
-  - pdf
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.12"
 
 sphinx:
   builder: html
   configuration: rtdocs/conf.py
 
+formats:
+  - pdf
+
 python:
   install:
     - requirements: rtdocs/requirements.txt