Update Rust crate markup5ever to 0.39.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
markup5ever	dependencies	minor	0.14.1 → 0.39.0

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Release Notes

servo/html5ever (markup5ever)

v0.35.0: 0.35.0

From this release forward, html5ever, xml5ever, markup5ever, and match_token are now released using a synced version number. Thus this release is version 0.35.0 of all of these crates.

Changes

• Version numbers of all crates apart from web_atoms are now in sync. (#​637)
• Remove dependency on the mac crate. (#​639)
• Remove unused TreeBuilder option. (#​631)
• Document scripting_enabled and iframe_srcdoc options (#​631)
• Don't return a string from TreeSink::attach_declarative_shadow_root (#​633)
• Determine the initial state for fragment parsing using the scripting flag of the context element (#​629)

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