change read the docs python version

docs/requirements.txt

@@ -1,4 +1,3 @@
 ipykernel
 nbsphinx
-sphinx-rtd-theme
-sdss-mugatu
+sphinx-rtd-theme

docs/sphinx/.readthedocs.yaml

@@ -0,0 +1,35 @@
+# Read the Docs configuration file for Sphinx projects
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the OS, Python version and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.9"
+    # You can also specify other tool versions:
+    # nodejs: "20"
+    # rust: "1.70"
+    # golang: "1.20"
+
+# Build documentation in the "docs/" directory with Sphinx
+sphinx:
+  configuration: docs/sphinx/conf.py
+  # You can configure Sphinx to use a different builder, for instance use the dirhtml builder for simpler URLs
+  # builder: "dirhtml"
+  # Fail on all warnings to avoid broken references
+  # fail_on_warning: true
+
+# Optionally build your docs in additional formats such as PDF and ePub
+# formats:
+#   - pdf
+#   - epub
+
+# Optional but recommended, declare the Python requirements required
+# to build your documentation
+# See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
+# python:
+#   install:
+#     - requirements: docs/requirements.txt

pyproject.toml

@@ -25,7 +25,7 @@ jupyter = "^1.0.0"
 ortools = "^9.1.9490"
 DateTime = "^4.3"
 notebook = "^6.4.12"
-astropy = "^5.2.2"
+astropy = "^5.3.3"
 
 [tool.poetry.dev-dependencies]