main/alpine-conf: upgrade to 3.15.0

main/alpine-conf/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=alpine-conf
-pkgver=3.15.0_rc4
+pkgver=3.15.0
 pkgrel=0
 pkgdesc="Alpine configuration management scripts"
 url="https://git.alpinelinux.org/alpine-conf/about"
@@ -30,5 +30,5 @@ check() {
 }
 
 sha512sums="
-091c6e1d87e58b3fdee3c68528b7b84eaa8adb00f2370e1084ab52f320e0c567f39f4a4fea71f6211f1d534b55cf2c30c456f33a1eb6c14d612d2ed69d1d4b10  alpine-conf-3.15.0_rc4.tar.gz
+058dd3d68817e2e3abd0598279d6fd202ad7888db95eb6f5c67e681273b28df28aade5dfe3244287556aa6545e1944506ac46e5e18e791c964dc128d76a9b689  alpine-conf-3.15.0.tar.gz
 "