Use in built rspec warnings rather than kernel #864

Job	Run time
Ruby 2.7 (Windows)	4m 23s
Rubocop	29s
Ruby 2.6 (Windows)	2m 46s
Ruby 3.3	2m 38s
Ruby 2.5 (Windows)	4m 40s
Legacy Ruby Builds (2.1.9)	1m 19s
Ruby 3.2	2m 20s
Ruby 2.4 (Windows)	2m 31s
Legacy Ruby Builds (2.0)	1m 22s
Ruby 2.3 (Windows)	2m 32s
Ruby 3.1	2m 24s
Legacy Ruby Builds (1.9.3)	1m 30s
Ruby 2.2 (Windows)	2m 32s
Ruby 3.0	2m 45s
Legacy Ruby Builds (1.9.2)	2m 19s
Ruby 2.7	3m 4s
Legacy Ruby Builds (1.8.7)	1m 19s
Ruby 2.6	4m 6s
Ruby 2.5	3m 56s
Legacy Ruby Builds (REE)	1m 36s
Legacy Ruby Builds (JRuby 1.7)	4m 16s
Ruby 2.4	2m 24s
Ruby 2.3	2m 33s
Legacy Ruby Builds (JRuby 1.7 1.8 mode)	3m 42s
Ruby 2.2	3m 3s
Legacy Ruby Builds (JRuby 9.1.17.0)	4m 55s
Ruby ruby-head	29s
Ruby jruby-9.2.13.0	7m 32s
Ruby 2.7 with diff-lcs 1.3	2m 53s
Ruby 2.7 with diff-lcs 1.4.3	2m 54s
	1h 25m 12s

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