Merge branch 'f-fix-accent-sensitivity' into 'dev'

Fix accent sensitivity

See merge request !90

.docker/docker-compose.yml

 version: '3.7'
 services:
   sqldb:
-    image: mariadb:10.11
+    image: mariadb:11.4
     environment:
       MYSQL_ROOT_PASSWORD: caosdb1234
     networks:

tests/test_issues_server.py

@@ -1555,7 +1555,6 @@ def test_263():
     assert exc.errors[0].msg == "Entity does not exist."  # TODO Or whatever the message shall be.
 
 
-@pytest.mark.xfail(reason="https://gitlab.com/linkahead/linkahead-server/-/issues/264")
 def test_264_accents_and_umlauts():
     """Test whether queries respect accents and
     umlauts. https://gitlab.com/linkahead/linkahead-server/-/issues/264.