[Buildroot] [PATCH] package/go: bump version to 1.12.9

[Peter Korsgaard]

>>>>> "Peter" == Peter Korsgaard <peter at korsgaard.com> writes:

 > For post-1.12.8 fixes. From the release notes:
 > go1.12.9 (released 2019/08/15) includes fixes to the linker, and the os and
 > math/big packages.

 > Signed-off-by: Peter Korsgaard <peter at korsgaard.com>

Committed to 2019.05.x, thanks.

For 2019.02.x I will instead bump to 1.11.13.
-- 
Bye, Peter Korsgaard