Update logback and json dependencies in examples (#315)

Signed-off-by: Ben Smith <benjsmi@us.ibm.com>

Author: benjsmi

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

@@ -15,7 +15,7 @@
 		<fabric-chaincode-java.version>2.5.0</fabric-chaincode-java.version>
 
 		<!-- Logging -->
-		<logback.version>1.2.0</logback.version>
+		<logback.version>1.3.11</logback.version>
 		<slf4j.version>1.7.5</slf4j.version>
 
 		<!-- Test -->
@@ -99,7 +99,7 @@
 		<dependency>
 			<groupId>org.json</groupId>
 			<artifactId>json</artifactId>
-			<version>20230227</version>
+			<version>20230618</version>
 		</dependency>
 
 	</dependencies>