Override RSpec::Support::StdErrSplitter#clone #669

Job	Run time
Rubocop	22s
Ruby 2.7 (Windows)	3m 52s
Legacy Ruby Builds (2.1.9)	35s
Ruby 2.6 (Windows)	6m 8s
Ruby 3.3	1m 36s
Legacy Ruby Builds (2.0)	34s
Ruby 2.5 (Windows)	3m 47s
Ruby 3.2	1m 19s
Legacy Ruby Builds (1.9.3)	33s
Ruby 2.4 (Windows)	2m 35s
Ruby 3.1	1m 29s
Legacy Ruby Builds (1.9.2)	29s
Ruby 2.3 (Windows)	2m 6s
Ruby 3.0	1m 42s
Legacy Ruby Builds (1.8.7)	33s
Ruby 2.2 (Windows)	2m 17s
Ruby 2.7	3m 3s
Legacy Ruby Builds (REE)	31s
Ruby 2.6	3m 5s
Legacy Ruby Builds (JRuby 1.7)	37s
Ruby 2.5	2m 48s
Ruby 2.4	1m 26s
Ruby 2.3	1m 34s
Legacy Ruby Builds (JRuby 1.7 1.8 mode)	29s
Ruby 2.2	1m 57s
Legacy Ruby Builds (JRuby 9.1.17.0)	36s
Ruby ruby-head	22s
Ruby jruby-9.2.13.0	1m 45s
Ruby 2.7 with diff-lcs 1.3	2m 46s
Ruby 2.7 with diff-lcs 1.4.3	2m 54s
	53m 50s

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