Merge pull request #1997 from web3j/logback-fix

Update logback version

build.gradle

@@ -30,7 +30,7 @@ ext {
     junitVersion = '5.5.2'
     web3jUnitVersion = '4.10.2'
     junitBenchmarkVersion = '0.7.2'
-    logbackVersion = '1.2.3'
+    logbackVersion = '1.4.14'
     mockitoJunitVersion = '3.1.0'
     junitPlatformLauncherVersion = '1.5.2'
 }