busybox: update to 1.29.3

busybox: update to 1.29.3

Updates busybox to version 1.29.3 to fix a bug related to parsing of
config files: 2993551ef ("Revert "libbb: remove unnecessary variable in
xmalloc_fgets"")

Upgrading the recipe was chosen instead of backporting the fix as a
patch because the only difference between version 1.29.2 and 1.29.3 is
this revert.

(From OE-Core rev: 11d4fd16c3d7dad5d7e3b4d44a96724075be7126)

Signed-off-by: Dustin Bain <dustin.bain@garmin.com>
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>