build(deps-dev): bump rspec from 3.12.0 to 3.13.0 #115

Job	Run time
tests (ubuntu-latest, 2.6)	31s
tests (ubuntu-latest, 2.7)	32s
tests (ubuntu-latest, 3.0)	12s
tests (ubuntu-latest, 3.1)	13s
tests (ubuntu-latest, head)	15s
tests (ubuntu-latest, truffleruby)	30s
tests (ubuntu-latest, truffleruby-head)	35s
tests (macos-latest, 2.6)	1m 34s
tests (macos-latest, 2.7)	1m 17s
tests (macos-latest, 3.0)	43s
tests (macos-latest, 3.1)	44s
tests (macos-latest, head)	24s
tests (macos-latest, truffleruby)	1m 16s
tests (macos-latest, truffleruby-head)	1m 7s
Coverage	5s
	9m 58s

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