sci-geosciences/grass: Revbump post dep change

Signed-off-by: Michał Górny <mgorny@gentoo.org>

diff --git a/sci-geosciences/grass/grass-7.4.4-r1.ebuild b/sci-geosciences/grass/grass-7.4.4-r2.ebuild
similarity index 100%
rename from sci-geosciences/grass/grass-7.4.4-r1.ebuild
rename to sci-geosciences/grass/grass-7.4.4-r2.ebuild