main/pax-utils: update source url

Current source url is 404, update it to a working url.

main/pax-utils/APKBUILD

@@ -12,7 +12,7 @@ depends="scanelf"
 makedepends_host="linux-headers libcap-dev"
 makedepends="$makedepends_host"
 checkdepends="bash python3 py3-elftools"
-source="https://dev.gentoo.org/~slyfox/distfiles/pax-utils-$pkgver.tar.xz"
+source="https://dev.gentoo.org/~sam/distfiles/pax-utils-$pkgver.tar.xz"
 subpackages="$pkgname-doc scanelf:_scanelf lddtreepax:_lddtreepax:noarch"
 
 build() {