Bump up v5.1.1.1 #51

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (2.5, ubuntu-latest)	49s
test (2.5, macos-latest)	1m 34s
test (2.5, windows-latest)	4m 48s
test (2.6, ubuntu-latest)	57s
test (2.6, macos-latest)	1m 30s
test (2.6, windows-latest)	4m 24s
test (2.7, ubuntu-latest)	1m 3s
test (2.7, macos-latest)	1m 24s
test (2.7, windows-latest)	3m 3s
test (3.0, ubuntu-latest)	28s
test (3.0, macos-latest)	26s
test (3.0, windows-latest)	2m 52s
test (3.1, ubuntu-latest)	28s
test (3.1, macos-latest)	40s
test (3.1, windows-latest)	3m 23s
test (3.2, ubuntu-latest)	25s
test (3.2, macos-latest)	36s
test (3.2, windows-latest)	3m 38s
test (head, ubuntu-latest)	20s
test (head, macos-latest)	38s
test (head, windows-latest)	2m 19s
test (jruby, ubuntu-latest)	1m 57s
test (jruby, macos-latest)	1m 50s
test (jruby, windows-latest)	3m 39s
test (jruby-head, ubuntu-latest)	1m 39s
test (jruby-head, macos-latest)	1m 37s
test (jruby-head, windows-latest)	4m 49s
test (windows-latest, ucrt)	2m 9s
test (windows-latest, mingw)	2m 17s
test (windows-latest, mswin)	5m 9s
	1h 0m 55s

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