Test with Python 3.11 instead of 3.9

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

.gitlab-ci.yml

@@ -3,8 +3,8 @@ stages:
   - test
   - docker
 
-py39:
-  image: python:3.9
+py310:
+  image: python:3.10
   tags:
     - lightweight
   script:
@@ -15,9 +15,9 @@ py39:
     reports:
       junit: test-results.xml
 
-py310:
+py311:
   allow_failure: true
-  image: python:3.10
+  image: python:3.11
   tags:
     - lightweight
   script: