dist/debian: switch to boost-1.65
dist/debian: switch to boost-1.65

We get following compile error on Debian/Ubuntu with boost-1.63:

/opt/scylladb/include/boost/intrusive/pointer_plus_bits.hpp:76:48: error: '*((void*)& __tmp +136)' is used uninitialized in this function [-Werror=uninitialized]
       n = pointer(uintptr_t(p) | (uintptr_t(n) & Mask));
                                         ~~~~~~~~~~~~~~^~~~~~~

This is known issue (https://github.com/boostorg/intrusive/issues/29), fixed
on boost-1.65.

Switch to boost-1.65 to fix the issue.

Fixes #3090

duarten/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,avikivity/scylla,duarten/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla