Log Message:
gumbo-parser: update to 0.12.2

- Add support for <search> tag
- Add special handling for <hr> tag in <select> context
- Fix potential segfault in gumbo_caret_diagnostic_to_string
- Fix pretty bad integer overflow in the numeric entity parsing code
- Fix foreign context handling
- Adjust token foreign attributes
- Remove special handling for <isindex> tag
- Remove special handling for <menuitem> tag
- Update autoconf version requirements to 2.72
- Drop GYP build system support