Log Message:
www/ruby-unicorn: update to 6.0.0

6.0.0 (2021-03-17)

No release note nor changelog.  Here are quote from commit log.

* tests: force blocking I/O for Ruby 3.x
* http_request: drop unnecessary #clear call
* Allocate a new request for each client
* test/test_helper: only unlink redirected logs from parent