get RTD working again

Author: scottprahl

.readthedocs.yaml

@@ -6,7 +6,7 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.11"
+    python: "3.12"
 
 sphinx:
    configuration: docs/conf.py
@@ -15,4 +15,5 @@ python:
   install:
     - method: pip
       path: .
-    - requirements: docs/requirements.txt
+      extra_requirements:
+        - docs

pyproject.toml

@@ -48,6 +48,14 @@ dependencies = [
 ]
 dynamic = ["version"]
 
+[project.optional-dependencies]
+docs = [
+  "Sphinx==8.1.3",
+  "nbsphinx==0.9.7",
+  "sphinx_automodapi",
+  "sphinx_rtd_theme",
+]
+
 [project.urls]
 Homepage = "https://github.com/scottprahl/miepython"
 Documentation = "https://miepython.readthedocs.io"