ci: Add Python 3.11 to test matrices

Author: ales-erjavec

.github/workflows/test.yml

@@ -37,7 +37,7 @@ jobs:
       fail-fast: False
       matrix:
         os: [ubuntu-20.04]
-        python-version: [3.8, 3.9, '3.10']
+        python-version: [3.8, 3.9, '3.10', '3.11']
         tox_env: [orange-released]
         name: [Released]
         include:
@@ -116,7 +116,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-latest, windows-latest]
-        python-version: [3.8, 3.9, '3.10']
+        python-version: [3.8, 3.9, '3.10', '3.11']
         tox_env: [orange-released]
         name: [Released]
         include: