update java driver to version 7.15.0 (#324)

Author: rashtao

pom.xml

@@ -61,7 +61,7 @@
 
     <properties>
         <java-module-name>com.arangodb.springframework</java-module-name>
-        <arangodb.version>7.12.0</arangodb.version>
+        <arangodb.version>7.15.0</arangodb.version>
 
         <!-- enforce dependencies convergence -->
         <slf4j>2.0.16</slf4j>
@@ -262,7 +262,7 @@
         <dependency>
             <groupId>com.arangodb</groupId>
             <artifactId>jackson-dataformat-velocypack</artifactId>
-            <version>4.4.0</version>
+            <version>4.5.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>