tests(python): add tests against python 3.11

ci/shell.nix

@@ -85,6 +85,7 @@ stdenvNoCC.mkDerivation ({
     # install other python versions for tox testing
     # NOTE: running e.g. "python3" in the shell runs the first version in the following list,
     #       and poetry uses the default version (currently 3.10)
+    python311
     python310
     python39
     python38

python/tox.ini

@@ -7,9 +7,9 @@
 
 [tox]
 envlist =
-    py{36,37,38,39,310}-{minimal,default,full}
-    py{36,37,38,39,310}-click{7,80}
-    py{37,38,39,310}-click81
+    py{36,37,38,39,310,311}-{minimal,default,full}
+    py{36,37,38,39,310,311}-click{7,80}
+    py{37,38,39,310,311}-click81
 
 [testenv]
 deps =
@@ -28,7 +28,7 @@ commands =
     # Run test suite
     !minimal: pytest --random-order tests
 
-[testenv:py{36,37,38,39,310}-click{7,80,81}]
+[testenv:py{36,37,38,39,310,311}-click{7,80,81}]
 deps =
     -rrequirements.txt
     click7: click>=7,<8