fix: revert libxml2 regression with HTML4 recovery (v1.13.x branch) #2463
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What problem is this PR intended to solve?
Fixes #2461 by reverting the relevant upstream commit in libxml2.
Have you included adequate test coverage?
Yes, this PR includes additional test coverage for start tag recovery by the HTML4 parser.
Does this change affect the behavior of either the C or the Java implementations?
This keeps the HTML4 parser behavior identical in both CRuby and JRuby implementations (they diverged in v1.13.2 due to #2461).