This updates the following external libraries to their latest versions:
- `polyfill-library` from `4.4.0` to `4.7.0`.
- `regenerator-runtime` from `0.13.9` to `0.13.11`.
These updates are minor without any breaking changes.
These libraries are no longer used by Core itself and maintained as a courtesy. Any projects relying on them should reevaluate their usage as modern browsers have made these almost entirely unnecessary.
Fixes#57646.
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