Log Message:
devel/ruby-msgpack: update to 1.6.0

2022-09-30 (1.6.0)

* Fix a potential use-after-free bug in Buffer_free when accessing a packer
  or unpacker buffer.

* `old-style-definition` compilation warnings.

* Restore zero-copy buffer feed when provided a Ruby string. This was
  accidentally broken in 1.5.4.

* Provide implementations for `ObjectSpace.memsize`. Message pack objects
  now properly report their size to Ruby.

* Fix an endianess bug on Windows platform.