snapcraft: limit version string to 32 characters
snapcraft: limit version string to 32 characters

Snaps are limited to a 32 character version string, so truncate
overly long version strings.

Signed-off-by: Colin Ian King <d100aa70785e45ee8deab668147d941941915c21@canonical.com>

iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace