package/libass: bump version to 0.17.4

Release notes: https://github.com/libass/libass/releases/tag/0.17.4

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/libass/libass.hash

@@ -1,3 +1,3 @@
 # Locally computed
-sha256  eae425da50f0015c21f7b3a9c7262a910f0218af469e22e2931462fed3c50959  libass-0.17.3.tar.xz
+sha256  78f1179b838d025e9c26e8fef33f8092f65611444ffa1bfc0cfac6a33511a05a  libass-0.17.4.tar.xz
 sha256  f7e30699d02798351e7f839e3d3bfeb29ce65e44efa7735c225464c4fd7dfe9c  COPYING

package/libass/libass.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBASS_VERSION = 0.17.3
+LIBASS_VERSION = 0.17.4
 LIBASS_SOURCE = libass-$(LIBASS_VERSION).tar.xz
 # Do not use the github helper here, the generated tarball is *NOT*
 # the same as the one uploaded by upstream for the release.