SORMAS-Foundation#3927 fix version_number

Author: FredrikSchäferVitagroup

sormas-backend/src/main/resources/sql/sormas_schema.sql

@@ -6232,6 +6232,6 @@ CREATE TABLE systemevent (
 
 ALTER TABLE systemevent OWNER TO sormas_user;
 
-INSERT INTO schema_version (version_number, comment) VALUES (303, 'Add system events #3927');
+INSERT INTO schema_version (version_number, comment) VALUES (304, 'Add system events #3927');
 
 -- *** Insert new sql commands BEFORE this line ***