fix(deps): allow elasticsearch/elasticsearch v8 for ES 7.x server compatibility

Widen requirement from ^9.0.0 to ^8.17.0 || ^9.0.0 so the library
works with both ES 7.x (via v8 client) and ES 8.x+ (via v9 client).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Spamercz

composer.json

@@ -28,7 +28,7 @@
 		"ext-json": "*",
 		"ext-curl": "*",
 		"spameri/elastic-query": "dev-master",
-		"elasticsearch/elasticsearch": "^9.0.0",
+		"elasticsearch/elasticsearch": "^8.17.0 || ^9.0.0",
 		"guzzlehttp/guzzle": "^7.9",
 		"nette/di": "^3.1.10",
 		"nette/utils": "^4.0.0|^3.2.5",