I'm not sure how you ended up with xbps still linked to libssl.so.29, because it was the first
package rebuilt against libressl-2.1.3.

Anyway you can still get the static binary and update your system:

http://repo.voidlinux.eu/static/

xbps-static-latest.armv6l-musl.tar.xz
xbps-static-latest.i686-musl.tar.xz
xbps-static-latest.x86_64-musl.tar.xz