YugabyteDB: format and rewrite tests using AssertJ

Author: Martin7-1

embedding-stores/langchain4j-community-yugabytedb/pom.xml

@@ -62,7 +62,7 @@
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
-            <version>42.7.4</version>
+            <version>42.7.8</version>
         </dependency>
 
         <!-- Enable PGVector data type -->