Skip new-JSON tests on ClickHouse < 24.8

CI in mymarilyn/clickhouse-driver runs the matrix from 19.x to
25.5.x. The new ``JSON`` data type and its ``enable_json_type``
setting only exist from 24.8 onwards; on older servers the CLI
flag is rejected outright and ``::JSON`` is the legacy
``Object('json')`` tuple. Bump ``required_server_version`` so the
suite is skipped instead of failing on those rows.

beep boop

Author: khvn26

tests/columns/test_newjson.py

@@ -2,7 +2,7 @@
 
 
 class NewJSONTestCase(BaseTestCase):
-    required_server_version = (22, 3, 2)
+    required_server_version = (24, 8, 0)
 
     def client_kwargs(self, version):
         return {"settings": {"enable_json_type": True}}