community/optipng: security upgrade to 0.7.8

https://optipng.sourceforge.net/history.txt

community/optipng/APKBUILD

 # Maintainer: Michael Koloberdin <koloberdin@gmail.com>
 pkgname=optipng
-pkgver=0.7.7
-pkgrel=1
+pkgver=0.7.8
+pkgrel=0
 pkgdesc="Compresses PNG files to a smaller size, without losing any information."
 url="https://optipng.sourceforge.net/"
 arch="all"
 license="Zlib"
 makedepends="libpng-dev"
 subpackages="$pkgname-doc"
-source="https://downloads.sourceforge.net/sourceforge/$pkgname/$pkgname-$pkgver.tar.gz"
+source="https://downloads.sourceforge.net/sourceforge/optipng/optipng-$pkgver.tar.gz"
 
 # secfixes:
 #   0.7.7-r0:
@@ -32,4 +32,6 @@ package() {
 	install -Dm0644 LICENSE.txt "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
 }
 
-sha512sums="c33b7650143ab39944d2c066e07e10273c37024c5bfe7c00475bfb513af96afa081ff388164845d426d3bce624c0282dee574fa150e963f18d3683d821030280  optipng-0.7.7.tar.gz"
+sha512sums="
+def47bb2898d9409773df55a99fec84af2a26b58192127ac4624b2ff504762bc4735b5b945e788174eac695cc81be1b062088b42683b9c889dc42f94431210c3  optipng-0.7.8.tar.gz
+"