Workaround diofant#90

Author: skirpichev

.github/workflows/docs.yml

@@ -16,6 +16,7 @@ jobs:
           sudo apt-get install libgmp-dev
           sudo apt-get install texlive texlive-latex-extra latexmk
       - run: pip install --upgrade pip
+      - run: pip install -U git+https://github.com/picnixz/sphinx.git@fix/13188-classmethod-c
       - run: pip --verbose install --editable .[docs]
       - run: |
           alias sphinx-build='sphinx-build --color -W --keep-going'

.readthedocs.yaml

@@ -11,10 +11,11 @@ build:
         python: "3"
 python:
     install:
+        - requirements: docs/requirements.txt
         - method: pip
           path: .
-          extra_requirements:
-              - docs
+#         extra_requirements:
+#             - docs
 sphinx:
     fail_on_warning: true
     configuration: docs/conf.py

docs/requirements.txt

@@ -0,0 +1 @@
+sphinx @ git+https://github.com/picnixz/sphinx.git@fix/13188-classmethod-c