main/libarchive: security upgrade to 3.7.7

https://github.com/libarchive/libarchive/releases/tag/v3.7.7

main/libarchive/APKBUILD

 # Contributor: Sergei Lukin <sergej.lukin@gmail.com>
 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=libarchive
-pkgver=3.7.6
+pkgver=3.7.7
 pkgrel=0
 pkgdesc="library that can create and read several streaming archive formats"
 url="https://libarchive.org/"
@@ -63,5 +63,5 @@ tools() {
 }
 
 sha512sums="
-3ca90d665772418b9ac444044511989e81e785a13db3c101851390ba7c2ba0793c799cedb9df990e900ab78c98207f70ecee7e21829578555dde99424950ae2a  libarchive-3.7.6.tar.xz
+2524f71f4c2ebc254a1927279be3394e820d0a0c6dec7ef835a862aa08c35756edaa4208bcdc710dd092872b59c200b555b78670372e2830822e278ff1ec4e4a  libarchive-3.7.7.tar.xz
 "