Fix SyntaxHighlighter::HTML to escape identifier values
#13212
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Identifiers can include special characters (namely
<and>) and thus must be escaped for use in HTML.This caused CI failures with updated docker build images (https://github.com/crystal-lang/distribution-scripts/pull/231/files) on Ubuntu 22.04 with libxml2 2.9.13.
https://app.circleci.com/pipelines/github/crystal-lang/crystal/11529/workflows/7fbbce79-346a-4cc3-967a-012367f78779/jobs/75252