package/sdl2: bump version to 2.28.1

Signed-off-by: Michael Fischer <mf@go-sys.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/sdl2/sdl2.hash

@@ -1,4 +1,4 @@
-# Locally calculated after checking http://www.libsdl.org/release/SDL2-2.26.5.tar.gz.sig
-sha256  ad8fea3da1be64c83c45b1d363a6b4ba8fd60f5bde3b23ec73855709ec5eabf7  SDL2-2.26.5.tar.gz
+# Locally calculated after checking http://www.libsdl.org/release/SDL2-2.28.1.tar.gz.sig
+sha256  4977ceba5c0054dbe6c2f114641aced43ce3bf2b41ea64b6a372d6ba129cb15d  SDL2-2.28.1.tar.gz
 # Locally calculated
 sha256  9928507f684c1965d07f2b6ef4b4723d5efc2f6b4ab731f743a413c51c319927  LICENSE.txt

package/sdl2/sdl2.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SDL2_VERSION = 2.26.5
+SDL2_VERSION = 2.28.1
 SDL2_SOURCE = SDL2-$(SDL2_VERSION).tar.gz
 SDL2_SITE = http://www.libsdl.org/release
 SDL2_LICENSE = Zlib