fix: Remove compromised link to polyfill.io

[jstlaurent]

Description

Remove scripts served from Polyfill.io, following security breach.

Checklist:

• ~[ ] Was this PR discussed in an issue? It is recommended to first discuss a new feature into a GitHub issue before opening a PR.~
• ~[ ] Add tests to cover the fixed bug(s) or the new introduced feature(s) (if appropriate).~
• ~[ ] Update the API documentation is a new function is added, or an existing one is deleted.~
• [X] Write concise and explanatory changelogs above.
• [X] If possible, assign one of the following labels to the PR: feature, fix or test (or ask a maintainer to do it for you).

[maclandrol]

Thanks @jstlaurent