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

---

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 - Between 12:00 AM and 03:59 AM, on day 1 of the month ( * 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 69.70%. Comparing base (5c571e0) to head (628f0b1).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1229   +/-   ##
=======================================
  Coverage   69.70%   69.70%           
=======================================
  Files          65       65           
  Lines        5373     5373           
  Branches     1182     1182           
=======================================
  Hits         3745     3745           
  Misses       1594     1594           
  Partials       34       34           

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.