HPCC-12402 - Key file for mysql test case out of date

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #6529 from richardkchapman/mysql-test-error

HPCC-12402 - Key file for mysql test case out of date

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>