Bump eventsource from 1.0.7 to 2.0.2 in /docs

Bumps [eventsource](https://github.com/EventSource/eventsource) from 1.0.7 to 2.0.2.
- [Release notes](https://github.com/EventSource/eventsource/releases)
- [Changelog](https://github.com/EventSource/eventsource/blob/master/HISTORY.md)
- [Commits](https://github.com/EventSource/eventsource/compare/v1.0.7...v2.0.2)

---
updated-dependencies:
- dependency-name: eventsource
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/package.json

@@ -213,7 +213,7 @@
     "etag": "^1.8.1",
     "eventemitter3": "^4.0.4",
     "events": "^3.2.0",
-    "eventsource": "^1.0.7",
+    "eventsource": "^2.0.2",
     "evp_bytestokey": "^1.0.3",
     "execa": "^4.0.3",
     "expand-brackets": "^4.0.0",