Use proper locale in history encoding test #3970

Job	Run time
lint	8s
Debug compatibility test	5m 51s
ruby-versions / Generate Ruby versions	2s
rake test 2.7 (latest reline)	1m 32s
vterm-yamatanooroti 2.7 (latest reline)	1m 7s
rake test 2.7	1m 31s
vterm-yamatanooroti 2.7	1m 6s
rake test 3.0 (latest reline)	1m 26s
vterm-yamatanooroti 3.0 (latest reline)	1m 16s
rake test 3.0	1m 23s
vterm-yamatanooroti 3.0	58s
rake test 3.1 (latest reline)	1m 25s
vterm-yamatanooroti 3.1 (latest reline)	58s
rake test 3.1	1m 25s
vterm-yamatanooroti 3.1	1m 2s
rake test 3.2 (latest reline)	1m 31s
vterm-yamatanooroti 3.2 (latest reline)	1m 2s
rake test 3.2	1m 28s
vterm-yamatanooroti 3.2	57s
rake test 3.3 (latest reline)	1m 23s
vterm-yamatanooroti 3.3 (latest reline)	1m 1s
rake test 3.3	1m 23s
vterm-yamatanooroti 3.3	2m 14s
rake test head (latest reline)	1m 17s
vterm-yamatanooroti head (latest reline)	52s
rake test head	1m 16s
vterm-yamatanooroti head	53s
rake test truffleruby-head (latest reline)	2m 42s
rake test truffleruby-head	2m 52s
	42m 1s

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