Bump logback to 1.5.15

Signed-off-by: David Enyeart <[email protected]>

Author: denyeart

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

@@ -15,7 +15,7 @@
 		<fabric-chaincode-java.version>2.5.4</fabric-chaincode-java.version>
 
 		<!-- Logging -->
-		<logback.version>1.3.14</logback.version>
+		<logback.version>1.5.15</logback.version>
 		<slf4j.version>1.7.5</slf4j.version>
 
 		<!-- Test -->