CI: Bump to ubuntu-24.04 and mambaforge-23.11 in ReadTheDocs (#3296)

Xref https://docs.readthedocs.io/en/stable/config-file/v2.html#build-os and https://docs.readthedocs.io/en/stable/config-file/v2.html#build-tools-python.

Author: weiji14

.readthedocs.yaml

@@ -6,9 +6,9 @@ version: 2
 
 # Set the version of Python and other tools you might need
 build:
-  os: ubuntu-22.04
+  os: ubuntu-24.04
   tools:
-    python: "mambaforge-22.9"
+    python: "mambaforge-23.11"
   jobs:
     post_checkout:
       # Cancel building pull requests when there aren't changes related to docs.