devel/ruby-mixlib-shellout: update to 3.2.2

3.2.2 (2020-11-16)

* Remove copyright dates #225 (tas50)
* Cleanup deps and fix the failing spec helper loading of support files
  #226 (tas50)

v3.2.0 (2020-11-12)

* Windows: fetch env variables for specified users #224 (kapilchouhan99)

v3.1.7 (2020-10-29)

* Loosen win32-process dep to resolve Ruby 3 deprecation warnings #223
  (tas50)

(taca)