testing/htslib: upgrade to 1.19

testing/htslib/APKBUILD

 # Contributor: Grigory Kirillov <txgk@bk.ru>
 # Maintainer:
 pkgname=htslib
-pkgver=1.18
+pkgver=1.19
 pkgrel=0
 pkgdesc="C library for high-throughput sequencing data formats"
 url="https://github.com/samtools/htslib"
@@ -45,5 +45,5 @@ package() {
 }
 
 sha512sums="
-48e33276e12e77cfd06f58df6b744406de624c8e89cfcef77ad195e97169a4b40b18ad2aa43f0dce31835492708805fa132957a1ebecfa6a6eedd5df3b994758  htslib-1.18.tar.bz2
+0001a5aba59bf655470fc3e0444b1b51575391f2b47e50bb66d0722407bfba744611ceaf8405450c4a630d506a583ef42e46bfa0842b2a95ea48cb359164f26a  htslib-1.19.tar.bz2
 "