Previously #2297.

• Run ./bin/amphtml-update.sh
• Examine diff for changelog
• Update spec generator as needed based on spec format changes
• Modify validating sanitizer based on changes to spec, if needed
• Add tests for key changes
• Add support for components requiring an origin trial token. See Update validating sanitizer to be aware of satisfies/requires constraints #2551.

Changelog

• Allow SVG inside of Stories
• Introduce amp-ad-custom (docs for this seem absent)
• Introduce amp-autocomplete with its dedicated input field
• Introduce amp-connatix-player
• Introduce amp-truncate-text, add slot to globally allowed attributes.
• Introduce amp-user-location
• Add mask-trim-zeros to input for amp-inputmask
• Add amp-bind [defaulttext] attribute to textarea (Clearing a form will reset the element to its binding value with input and not textarea amphtml#21053)
• Update amp-script:
  • This is the first update to the spec after amp-script has been uncommented from the validator (Validator rollup amphtml#22413)
  • Add unique constraint.