Update the EPSS importer to retrieve all historical data.

[ziadhany]

The current EPSS importer retrieves data daily from the API.

The EPSS website (https://www.first.org/epss/data_stats) also provides access to historical data.

All daily historical EPSS data is available in this GitHub repository:
https://github.com/empiricalsec/epss_scores

[Samk1710]

@ziadhany This makes sense. Are you updating this?