(v1.11.x) update tests to work with system libxml 2.9.12, and work around windows dll unloading issue #2243
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What problem is this PR intended to solve?
#2241. This is applying #2240 to the v1.11.x branch for a patch release.
Have you included adequate test coverage?
Existing test coverage is adequate on Appveyor, however in this PR we also add Github Actions coverage which is a bit faster than Appveyor for faster feedback loops.
Does this change affect the behavior of either the C or the Java implementations?
It changes the behavior of libxml2's memory management, but only on Windows when using system DLLs.