fix(deps): update dependency eventsource to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
eventsource	^2.0.2 -> ^4.0.0

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Release Notes

EventSource/eventsource (eventsource)

v4.0.0

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⚠ BREAKING CHANGES

• FetchLikeInit is now removed. Use
  EventSourceFetchInit.
• Drop support for Node.js v18, as it is end-of-life.

Features

• require node.js v20 or higher (91a3a48)

Bug Fixes

• drop FetchLikeInit type. Use EventSourceFetchInit instead. (6786e46)

v3.0.7

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Bug Fixes

• mark fetch init properties required in typings (1282872)

v3.0.6

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Bug Fixes

• upgrade parser to latest version, improving performance (59a5ddd)

v3.0.5

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Bug Fixes

• include message and code on errors when logging in node.js and deno (f2596b3)

v3.0.4

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Bug Fixes

• ensure message is set on ErrorEvent on network errors (d1dc711)

v3.0.3

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Bug Fixes

• bundle event listener typings (2c51349)

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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