Backport PR #14148: fix RTD

.readthedocs.yaml

@@ -0,0 +1,16 b''
+version: 2
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
+sphinx:
+  configuration: docs/source/conf.py
+
+# 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

MANIFEST.in

@@ -14,6 +14,7 b' exclude tools'
 exclude CONTRIBUTING.md
 exclude .editorconfig
 exclude SECURITY.md
+exclude .readthedocs.yaml
 
 graft scripts