user/gtk+3.0: Update to 3.24.21

user/gtk+3.0/APKBUILD

 # Maintainer: 
 pkgname=gtk+3.0
-pkgver=3.24.13
+pkgver=3.24.21
 pkgrel=0
 pkgdesc="The GTK+ Toolkit (v3)"
 url="https://www.gtk.org/"
@@ -48,4 +48,4 @@ package() {
 	rm -f "$pkgdir"/usr/share/man/man1/gtk-update-icon-cache.1
 }
 
-sha512sums="9129d4574cca258b4a517d8d65dad246a746fc3dc574b78e098db9aa9743956ce227efbf963f63e1e0f1a1a09810716150526b2bfe8015a5960bad38b0c88406  gtk+-3.24.13.tar.xz"
+sha512sums="97ed88e69d9002279869044772e5aebc1ac4ed6f4a8afc1586a349710a1d414fc735e1257d5f34f6300914a0ca7c7ede073bd9429ee16077aa83f3594784c60e  gtk+-3.24.21.tar.xz"