Add Python 3.11 to the testing

Author: cclauss

.github/workflows/build.yml

@@ -13,6 +13,7 @@ jobs:
           - { VERSION: "3.8", TOXENV: "py38",ALLOW_FAILURE: false }
           - { VERSION: "3.9", TOXENV: "py39",ALLOW_FAILURE: false }
           - { VERSION: "3.10", TOXENV: "py310",ALLOW_FAILURE: false }
+          - { VERSION: "3.11", TOXENV: "py311",ALLOW_FAILURE: false }
           - { VERSION: "3.10", TOXENV: "flake8,doclint,docs,commitlint", ALLOW_FAILURE: false }
           - { VERSION: "3.10", TOXENV: "docstrings", ALLOW_FAILURE: true}
           - { VERSION: "pypy3.9", TOXENV: "pypy", ALLOW_FAILURE: false }