chore(deps): update dependency eventsource to v4 #2754

Job	Run time
Generate Node Version Matrix	5s
Build Harper (Windows, Node.js v24)	2m 49s
Build Harper (Node.js v24)	1m 19s
Build Harper (Node.js v22)	1m 16s
Build Harper (Node.js v26)	1m 13s
Integration API Tests (Node.js v26)	6m 8s
Integration API Tests (Node.js v22)	6m 7s
Integration Tests 1/4 (Bun)	1m 28s
Integration Tests 4/4 (Bun)	1m 34s
Integration Tests 3/4 (Bun)	1m 9s
Integration API Tests (Node.js v24)	5m 57s
Integration Tests 2/4 (Bun)	1m 52s
Integration Tests 3/4 (Node.js v22)	2m 4s
Integration Tests 2/4 (Node.js v22)	1m 54s
Integration Tests 4/4 (Node.js v22)	2m 32s
Integration Tests 2/4 (Node.js v24)	1m 54s
Integration Tests 3/4 (Node.js v24)	2m 2s
Integration Tests 1/4 (Node.js v24)	1m 32s
Integration Tests 2/4 (Node.js v26)	2m 1s
Integration Tests 4/4 (Node.js v26)	2m 33s
Integration Tests 4/4 (Node.js v24)	2m 29s
Integration Tests 1/4 (Node.js v26)	1m 45s
Integration Tests 1/4 (Node.js v22)	1m 36s
Integration Tests 3/4 (Node.js v26)	1m 57s
Integration API Tests (Bun)	0s
Integration API Tests (Windows, Node.js v24)	6m 53s
Integration Tests 2/4 (Windows, Node.js v24)	6m 10s
Integration Tests 3/4 (Windows, Node.js v24)	4m 34s
Integration Tests 4/4 (Windows, Node.js v24)	3m 17s
Integration Tests 1/4 (Windows, Node.js v24)	2m 39s
	1h 18m 49s

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