Ensure parser error snippets are valid UTF-8 #839

Job	Run time
Ruby memcheck	2m 3s
ruby-versions / Generate Ruby versions	2s
ubuntu-latest 2.7	49s
ubuntu-latest 3.0	25s
ubuntu-latest 3.1	24s
ubuntu-latest 3.2	24s
ubuntu-latest 3.3	25s
ubuntu-latest 3.4	23s
ubuntu-latest head	1m 14s
ubuntu-latest jruby	1m 3s
ubuntu-latest jruby-head	2m 23s
macos-14 2.7	53s
macos-14 3.0	21s
macos-14 3.1	24s
macos-14 3.2	16s
macos-14 3.3	18s
macos-14 3.4	19s
macos-14 head	23s
macos-14 jruby	46s
macos-14 jruby-head	41s
windows-latest 2.7	5m 27s
windows-latest 3.0	3m 33s
windows-latest 3.1	3m 45s
windows-latest 3.2	2m 16s
windows-latest 3.3	2m 37s
windows-latest 3.4	3m 7s
windows-latest head	1m 20s
ubuntu-24.04-arm 3.4	31s
macos-13 3.4	47s
windows-latest mswin	1m 27s
ubuntu-latest jruby-9.4	1m 9s
macos-latest truffleruby-head	37s
ubuntu-latest truffleruby-head	2m 8s
	42m 40s

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