testing/amsynth: upgrade to 1.13.0

testing/amsynth/APKBUILD

 # Contributor: David Demelier <markand@malikania.fr>
 # Maintainer: David Demelier <markand@malikania.fr>
 pkgname=amsynth
-pkgver=1.12.4
+pkgver=1.13.0
 pkgrel=0
 pkgdesc="easy-to-use software synth with a classic subtractive synthesizer topology"
 url="https://amsynth.github.io"
@@ -38,5 +38,5 @@ lv2() {
 }
 
 sha512sums="
-502fdd1d6c4e54a57482d266977d78008efa26717c173be0bf98e907a111366fd80b65d667b9448e751085901dc5f2a61ac0bf5b1d02e35c695ecd99c9d1df00  amsynth-1.12.4.tar.gz
+29698be7d690c76a46a0c8306d6c3b94630b25ed9a3524d7e27d22e244f5c144b74b8473f09eecdb1368443f503ba7024d1c71ead6794f11a2d1cb2114c84bd5  amsynth-1.13.0.tar.gz
 "