Do not violate G-2135 in good and bad example of G-2145

The variable `l_parallel_degree` is not used in the good and bad example of [G-2145](https://trivadis.github.io/plsql-and-sql-coding-guidelines/v4.2/4-language-usage/2-variables-and-types/1-general/g-2145/#example-bad).

Add a `do_something(l_parallel_degree);` call to avoid this.
