Update dependency @webcomponents/webcomponentsjs to ^2.8.0

[renovate]

This PR contains the following updates:

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

---

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)

---

Configuration

📅 Schedule: Branch creation - "* 0-3 1 * *" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.25%. Comparing base (c067962) to head (5c26001).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1229   +/-   ##
=======================================
  Coverage   69.25%   69.25%           
=======================================
  Files          60       60           
  Lines        5135     5135           
  Branches     1087     1087           
=======================================
  Hits         3556     3556           
  Misses       1550     1550           
  Partials       29       29           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.