Update dependency eventsource to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
eventsource	2.0.2 -> 3.0.2

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Release Notes

EventSource/eventsource (eventsource)

v3.0.2

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Bug Fixes

• reference possibly missing event typings (d3b6849)

v3.0.1

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Bug Fixes

• run build prior to publishing (f86df19)

v3.0.0

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⚠ BREAKING CHANGES

• Drop support for Node.js versions below v18
• The module now uses a named export instead of a default export.
• UMD bundle dropped. Use a bundler.
• headers in init dict dropped, pass a custom fetch function instead.
• HTTP/HTTPS proxy support dropped. Pass a custom fetch function instead.
• https.* options dropped. Pass a custom fetch function that provides an agent/dispatcher instead.
• New default reconnect delay: 3 seconds instead of 1 second.
• Reconnecting after a redirect will now always use the original URL, even if the status code was HTTP 307.

Features

• modernize - use fetch, WebStreams, TypeScript, ESM (#​330) (40655f7)

Bug Fixes

• dispatchEvent now emits entire event object (eb430c0)
• empty options no longer disable certificate checks (372d387)

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