Bump example Maven junit and logback dependencies (#518)

- Updates `org.junit:junit-bom` from 6.0.2 to 6.0.3
- Updates `ch.qos.logback:logback-classic` from 1.5.29 to 1.5.31

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

examples/fabric-contract-example-maven/pom.xml

@@ -15,7 +15,7 @@
 		<fabric-chaincode-java.version>2.5.8</fabric-chaincode-java.version>
 
 		<!-- Logging -->
-		<logback.version>1.5.29</logback.version>
+		<logback.version>1.5.31</logback.version>
 		<slf4j.version>2.0.17</slf4j.version>
 
 	</properties>
@@ -32,7 +32,7 @@
             <dependency>
                 <groupId>org.junit</groupId>
                 <artifactId>junit-bom</artifactId>
-                <version>6.0.2</version>
+                <version>6.0.3</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>