Debian: attempt to fix unstable -> testing migration

https://release.debian.org/migration/testing.pl?package=tarantool:

Trying to update tarantool from 1.6.3.539.g211672f-1 to
1.6.7.551.ga5bafc5-1 (candidate is 25 days old):

+ tarantool/amd64 unsatisfiable Depends: binutils (<< 2.25.90.20151126)
+ missing build on XXX: tarantool-common (from 1.6.3.539.g211672f-1)