community/libspng: upgrade to 0.7.4

community/libspng/APKBUILD

 # Contributor: Alex Yam <alex@alexyam.com>
 # Maintainer: Alex Yam <alex@alexyam.com>
 pkgname=libspng
-pkgver=0.7.3
+pkgver=0.7.4
 pkgrel=0
 pkgdesc="modern alternative to libpng"
 url="https://github.com/randy408/libspng"
@@ -36,5 +36,5 @@ package() {
 }
 
 sha512sums="
-f8d7fd6b702cbba3e49289cc51802a5854ef6103578d82cc34b0acd73728b17744ab28c7c3d40666fce2e5fd8ea9f3120e34319d2039b511dac65266d9997aba  libspng-0.7.3.tar.gz
+cd729653599ed97f80d19f3048c1b3bc2ac16f922b3465804b1913bc45d9fc8b28b56bc2121fda36e9d3dcdd12612cced5383313b722a5342b613f8781879f1a  libspng-0.7.4.tar.gz
 "