Log Message:
devel/ruby-msgpack: update to 1.4.2

2021-02-01 version 1.4.2:

* Add the required Ruby version (>= 2.4) to avoid compilation errors on
  older Ruby runtimes
* Drop the support of old Ruby versions explicitly (1.8, 1.9, 2.0, 2.1,
  2.2, 2.3)

2021-01-27 version 1.4.1:

* Bugfix about the wrong string encoding longer than 256 bytes (#200)

2021-01-27 version 1.4.0:

* Introduce the optimization to use frozen/deduped keys for map objects
* Stop releasing fat gem (pre-built binaries) for mswin32 arch
  environments