Prefer `require_relative` for internal requires #181

Job	Run time
Tests (2.7, rails_6.1, stable)	44s
Tests (2.7, rails_7.0, stable)	44s
Tests (2.7, rails_7.1, stable)	49s
Tests (3.0, rails_6.1, stable)	22s
Tests (3.0, rails_7.0, stable)	22s
Tests (3.0, rails_7.1, stable)	28s
Tests (3.1, rails_6.1, stable)	24s
Tests (3.1, rails_7.0, stable)	37s
Tests (3.1, rails_7.1, stable)	33s
Tests (3.1, rails_7.2, stable)	30s
Tests (3.2, rails_7.0, stable)	27s
Tests (3.2, rails_7.1, stable)	33s
Tests (3.2, rails_7.2, stable)	35s
Tests (3.3, rails_7.0, stable)	27s
Tests (3.3, rails_7.1, stable)	32s
Tests (3.3, rails_7.2, stable)	28s
Tests (3.1, rails_edge, experimental)	54s
Tests (3.2, rails_edge, experimental)	35s
Tests (3.3, rails_edge, experimental)	31s
Tests (head, rails_7.1, experimental)	1m 32s
Tests (head, rails_7.2, experimental)	1m 40s
Tests (head, rails_edge, experimental)	1m 20s
Coverage	2s
	15m 9s

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