Add ruby 3.3 to test matrix #429

Job	Run time
lint	25s
test (2.1, gems/rails3.gemfile)	16s
test (2.2)	25s
test (2.3)	1m 31s
test (2.4)	1m 31s
test (2.5)	25s
test (2.6)	32s
test (2.6, gems/typhoeus.gemfile, typhoeus)	25s
test (2.6, gems/octoshark.gemfile)	26s
test (2.6, gems/rails3.gemfile, 1.17.3)	22s
test (2.7)	26s
test (2.7, true)	24s
test (3.0)	1m 22s
test (3.0, true)	1m 24s
test (3.0, gems/instruments.gemfile, instruments)	1m 30s
test (3.0, gems/instruments.gemfile, true, instruments)	1m 25s
test (3.0, gems/sidekiq.gemfile, sidekiq_install)	1m 24s
test (3.1)	19s
test (3.2)	16s
test (3.3)	27s
	15m 15s

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