Update dependency com.squareup.retrofit2:converter-gson to v3

Author: BlueTree242

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ serverassistantai = "1.3.1"
 
 # Dependencies
 langchain4j = "0.36.2"
-retrofit2 = "2.12.0"
+retrofit2 = "3.0.0"
 
 # Annotations
 lombok = "1.18.36"