ci: remove testing for CockroachDB 25.1

Author: timgraham

.github/workflows/tests.yml

@@ -44,11 +44,6 @@ jobs:
             use_psycopg2: psycopg2
           - crdb-version: v24.3.8
             use_server_side_binding: server_side_binding
-          - crdb-version: v25.1.2
-          - crdb-version: v25.1.2
-            use_psycopg2: psycopg2
-          - crdb-version: v25.1.2
-            use_server_side_binding: server_side_binding
           - crdb-version: v25.2.2
           - crdb-version: v25.2.2
             use_psycopg2: psycopg2