Build with Python 3.11 on CI and RTD (#985)

* Build with Python 3.11

* Use latest available Python 3 on CI

* Use latest available Python 3 on RTD

Author: hugovk

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: "3.10"
+          python-version: "3"
           cache: pip
       - name: Build docs
         run: make html

.readthedocs.yml

@@ -11,7 +11,7 @@ sphinx:
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.10"
+    python: "3"
 
   commands:
     - make dirhtml BUILDDIR=_readthedocs