Fix docs build

Author: gselzer

.readthedocs.yaml

@@ -1,9 +1,30 @@
+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
 version: 2
+build:
+   os: ubuntu-22.04
+   tools:
+      python: "3.11"
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+   configuration: doc/conf.py
+
+# Declare the Python requirements required to build your docs
+# python:
+#    install:
+#    - method: pip
+#      path: .
 
 build:
-  os: "ubuntu-20.04"
+  os: ubuntu-24.04
   tools:
-    python: "mambaforge-4.10"
-  
-conda:
-  environment: doc/environment.yml
+    python: "3.13"
+  jobs:
+    create_environment:
+      - python -m pip install --upgrade pip
+      - python -m pip --version
+      - python -m pip install --group ./pyproject.toml:dev