Revert nvmrc to a widely compatible string (#249) #446

Job	Run time
analyze	40s
collect-release-info	11s
collect-docsite-release-info	2s
unpublish_docsite	0s
test (3.0, rails_6_1, rspec_lt_3_10)	2m 23s
build-docsite	37s
test (3.0, rails_6_1, rspec_gte_3_10)	2m 19s
test (3.0, rails_7_0, rspec_lt_3_10)	2m 17s
test (3.0, rails_7_0, rspec_gte_3_10)	2m 19s
test (3.0, no_rails, rspec_lt_3_10)	1m 46s
test (3.0, no_rails, rspec_gte_3_10)	1m 47s
test (3.1, rails_6_1, rspec_lt_3_10)	2m 39s
test (3.1, rails_6_1, rspec_gte_3_10)	2m 15s
test (3.1, rails_7_0, rspec_lt_3_10)	2m 17s
test (3.1, rails_7_0, rspec_gte_3_10)	2m 26s
test (3.1, no_rails, rspec_lt_3_10)	1m 42s
test (3.1, no_rails, rspec_gte_3_10)	1m 53s
test (3.2, rails_6_1, rspec_lt_3_10)	2m 19s
test (3.2, rails_6_1, rspec_gte_3_10)	2m 19s
test (3.2, rails_7_0, rspec_lt_3_10)	2m 12s
test (3.2, rails_7_0, rspec_gte_3_10)	2m 23s
test (3.2, no_rails, rspec_lt_3_10)	1m 40s
test (3.2, no_rails, rspec_gte_3_10)	1m 40s
test (3.3, rails_6_1, rspec_lt_3_10)	2m 32s
test (3.3, rails_6_1, rspec_gte_3_10)	2m 32s
test (3.3, rails_7_0, rspec_lt_3_10)	2m 17s
test (3.3, rails_7_0, rspec_gte_3_10)	2m 17s
test (3.3, no_rails, rspec_lt_3_10)	1m 42s
test (3.3, no_rails, rspec_gte_3_10)	1m 48s
publish-docsite	8s
ready-to-merge	1s
	53m 23s

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