248cf06cf2
This has aged a little and we have a separate LTS image for testing on the older distros. Update it to a more recent release like its Fedora cousin. Besides it is useful to have something with gcc-9 on it for squashing those stringop truncation errors. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>