types.cc: fix the compilation with fmt v5.3.0
types.cc: fix the compilation with fmt v5.3.0

Compilation fails with fmt release 5.3.0 when we print a bytes_view
using "{}" formatter.

Compiler's complain is: "error: static assertion failed: mismatch
between char-types of context and argument"

Fix this by explicitly using to_hex() converter.

Signed-off-by: Vlad Zolotarov <976c0f8d0852ed6439ad273880b400a75a7c41d0@scylladb.com>

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