Fix NC-1707 pantheon CLI default values infinite loop (#266)

Picocli latest release 3.8.0 fixes the issue.

gradle/versions.gradle

@@ -45,7 +45,7 @@ dependencyManagement {
 
     dependency('com.github.docker-java:docker-java:3.0.14')
 
-    dependency('info.picocli:picocli:3.6.1')
+    dependency('info.picocli:picocli:3.8.0')
     dependency('net.consensys.cava:cava-toml:0.3.1')
 
     dependency('org.openjdk.jmh:jmh-core:1.21')

pantheon/src/main/java/tech/pegasys/pantheon/cli/PantheonCommand.java

@@ -142,7 +142,7 @@ public class PantheonCommand implements Runnable {
   @Option(
     names = {"--datadir"},
     paramLabel = MANDATORY_PATH_FORMAT_HELP,
-    description = "the path to Pantheon data directory"
+    description = "the path to Pantheon data directory (default: ${DEFAULT-VALUE})"
   )
   private final Path dataDir = getDefaultPantheonDataDir();