Add Python 3.13.0rc2 to the trial test matrix

.ci/scripts/calculate_jobs.py

@@ -53,7 +53,7 @@ def set_output(key: str, value: str):
             "database": "sqlite",
             "extras": "all",
         }
-        for version in ("3.9", "3.10", "3.11", "3.12")
+        for version in ("3.9", "3.10", "3.11", "3.12", "3.13.0rc2")
     )
 
 trial_postgres_tests = [