tests: handle upstream libxml2 returning null for UTF-8 enc handler #3271
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What problem is this PR intended to solve?
Example failure: https://github.com/sparklemotion/nokogiri/actions/runs/9774049613/job/26981486984
Let's just work around it in the tests. The behavior we're testing isn't specific to UTF-8, so let's just swap in ISO-2022-JP.
GNOME/libxml2@6d8427dc
Tagging @nwellnhof just for awareness.
Have you included adequate test coverage?
Yes
Does this change affect the behavior of either the C or the Java implementations?
N/A