Update open-telemetry/api version to ^1.8 (#1882)

Author: nolanpro

src/SDK/composer.json

@@ -20,7 +20,7 @@
         "php": "^8.1",
         "ext-json": "*",
         "nyholm/psr7-server": "^1.1",
-        "open-telemetry/api": "^1.7",
+        "open-telemetry/api": "^1.8",
         "open-telemetry/context": "^1.4",
         "open-telemetry/sem-conv": "^1.0",
         "php-http/discovery": "^1.14",