main/libphonenumber: bump pkgrel (soname bump)

so:libprotobuf.so.15 does not exist anymore in Alpine edge

aports/main/libphonenumber/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Bhushan Shah <bshah@kde.org>
 pkgname=libphonenumber
 pkgver=8.9.6
-pkgrel=2
+pkgrel=3
 pkgdesc="Library for parsing, formatting, and validating international phone numbers."
 url="https://github.com/googlei18n/libphonenumber"
 arch="all"