use smaller insert_block_size for uploading results to database, tryi…

…ng to address upload getting stuck

.github/upload_results_to_database.py

@@ -407,6 +407,7 @@ def upload_results(
                 port=db_port,
                 secure="y" if secure else None,
                 verify=verify,
+                insert_block_size=1048576 // 2,
             )
 
         with When("inserting test results"):