Update dependency @webcomponents/webcomponentsjs to ^2.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@webcomponents/webcomponentsjs (source)	^2.6.0 -> ^2.8.0

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Release Notes

webcomponents/polyfills (@​webcomponents/webcomponentsjs)

v2.8.0

Compare Source

• Update dependencies (#​542)
• Polyfill Element.toggleAttribute(). (#​541)

v2.7.0

Compare Source

• Polyfill addEventListener/removeEventListener event listener options,
  including {capture: boolean, once: boolean}.
  (#​469)
• Make webcomponents-loader.js compatible with the Trusted Types API
  (#​501)
• Remove an arrow function in webcomponents-loader.js.
  (#​507)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.48%. Comparing base (62615a8) to head (1ecf3bb).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1229   +/-   ##
=======================================
  Coverage   69.48%   69.48%           
=======================================
  Files          62       62           
  Lines        5306     5306           
  Branches     1149     1149           
=======================================
  Hits         3687     3687           
  Misses       1585     1585           
  Partials       34       34           

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