security: Do not use code hosted on polyfill.io.

[cafuego]

Refs: OPS-10543

[github-actions]

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[github-actions]

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[lazysoundsystem]

Grep shows it's also included in the choices library and the webform module:

../iasc8/html/libraries/choices/README.md
../iasc8/html/libraries/choices/public/index.html
../iasc8/html/modules/contrib/webform/webform.libraries.yml

it's also mentioned in the algolia.places library but only in comments.

There's a new version of webform https://www.drupal.org/project/webform/issues/3427662 but that module is also responsible for the choices library which hasn't yet been fixed: https://www.drupal.org/project/webform/issues/3457416

[lazysoundsystem]

It looks like we're not using webform, so my comment might be less important:
https://humanitarian.atlassian.net/browse/IASC-795

[lazysoundsystem]

Webform updated in #947