Generating the same random number per column values

I have a table which in which I would like to generate random numbers in a specific format (e.g. TEST-10256). For which I have been using the below:

concat('TEST-' , uniform(10000, 99000, RANDOM()))

However I now want to update a table with these random numbers based on two columns, so the desired outcome would be this:

I am not sure how to keep the same random value per previously matching it on the same values in ROW1 & ROW2.

Based on query from @Lukasz, we can use update statement.

-- Original

select * from test;

-- Update statement

update test t set t.row2 = t1.new_col
        from (select row1, row2, 
            CONCAT('TEST-' , uniform(10000, 99000, RANDOM())) new_col
            from (select distinct row1, row2 from test)
        )t1
    where t1.row1 = t.row1
        and t1.row2 = t.row2;

-- After update

select * from test;