grib-api 1.12.1

Previous version of grib-api (1.9.18) was released almost two years ago
(October 2012). Since then there has been three minor releases (1.10.x,
1.11.x, and 1.12.x) which have fixed a large number of bugs.
grib-api: add 1.12.1 bottle.

Closes #30357.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>