Remove hardcoded Ollama host in integration test

Eliminated hardcoded values for 'useExternalOllamaHost' and 'ollamaHost' in OllamaAPIIntegrationTest. The test now relies solely on environment variables for configuration.

src/test/java/io/github/ollama4j/integrationtests/OllamaAPIIntegrationTest.java

@@ -61,9 +61,6 @@ class OllamaAPIIntegrationTest {
                     Boolean.parseBoolean(System.getenv("USE_EXTERNAL_OLLAMA_HOST"));
             String ollamaHost = System.getenv("OLLAMA_HOST");
 
-            useExternalOllamaHost = true;
-            ollamaHost ="http://192.168.29.229:11434/";
-
             if (useExternalOllamaHost) {
                 LOG.info("Using external Ollama host...");
                 api = new OllamaAPI(ollamaHost);