Update version, gemspec, and CHANGELOG for 2.8.5 (#518) #256

Job	Run time
profile (2.7, native, ubuntu-20.04)	2m 49s
profile (2.7, pure, ubuntu-20.04)	2m 20s
test (2.2, ubuntu-20.04, Gemfile)	44s
test (2.3, ubuntu-20.04, Gemfile)	51s
test (2.4, ubuntu-20.04, Gemfile)	39s
test (2.5, ubuntu-20.04, Gemfile)	35s
test (2.6, ubuntu-20.04, Gemfile)	42s
test (2.7, ubuntu-20.04, Gemfile)	55s
test (3.0, ubuntu-20.04, Gemfile)	24s
test (3.1, ubuntu-20.04, Gemfile)	26s
test (3.2, ubuntu-20.04, Gemfile)	20s
test (jruby-9.1, ubuntu-20.04, Gemfile)	59s
test (jruby-9.2, ubuntu-20.04, Gemfile)	1m 1s
test (jruby-9.3, ubuntu-20.04, Gemfile)	52s
test (jruby-9.4, ubuntu-20.04, Gemfile)	48s
test (truffleruby-22.1, ubuntu-20.04, Gemfile)	2m 45s
test (truffleruby-22.2, ubuntu-20.04, Gemfile)	3m 28s
test (truffleruby-22.3, ubuntu-20.04, Gemfile)	3m 13s
test (ubuntu-20.04, 2.7, gemfiles/public_suffix_2.rb)	40s
test (ubuntu-20.04, 2.7, gemfiles/public_suffix_3.rb)	38s
test (ubuntu-20.04, 2.7, gemfiles/public_suffix_4.rb)	36s
test (ubuntu-22.04, 3.1)	25s
test (macos-11, 3.1)	30s
test (macos-12, 3.1)	34s
test (windows-2019, 3.1)	58s
test (windows-2022, 3.1)	2m 19s
test (windows-2022, jruby-9.3)	2m 52s
test (ubuntu-20.04, head, Gemfile, true)	24s
test (ubuntu-20.04, jruby-head, Gemfile, true)	46s
test (ubuntu-20.04, truffleruby-head, Gemfile, true)	3m 49s
coverage (2.7, ubuntu-20.04)	41s
	39m 3s

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