fix: lower number of import users

Author: tamassoltesz

src/test/java/io/supertokens/storage/postgresql/test/OneMillionUsersTest.java

@@ -990,7 +990,7 @@ public void testWithOneMillionUsers() throws Exception {
 
         Main main = startCronProcess(String.valueOf(4)); // ci uses instances with 4 cores..
 
-        int NUMBER_OF_USERS_TO_UPLOAD = 500000; // half million
+        int NUMBER_OF_USERS_TO_UPLOAD = 300000; 
 
         if (StorageLayer.getBaseStorage(main).getType() != STORAGE_TYPE.SQL || StorageLayer.isInMemDb(main)) {
             return;