chore: update event-source-polyfill locally
chore: update event-source-polyfill locally

...in order to get rid of the issue:

```txt
fixture-hops:warning ./node_modules/event-source-polyfill/src/eventsource.js 94:6-62
Critical dependency: the request of a dependency is an expression
```

xing/hops,xing/hops,xing/hops