Change CycloneDx dependency jar download to use Maven Central download

Signed-off-by: Andrew Leonard <[email protected]>

README.md

@@ -186,7 +186,11 @@ the one you are trying to build.
 if using docker, keep the container after the build.
 
 --local-dependency-cache-dir <Local dependency cache directory>
-specify the location of a local cache of required build dependency jars
+specify the location of a local cache of required build dependency jars. If not specified
+the following default locations are searched
+Windows: c:/dependency_cache
+MacOs: ${HOME}/dependency_cache
+Unix: /usr/local/dependency_cache
 
 --make-exploded-image
 creates an exploded image (useful for codesigning jmods). Use --assemble-exploded-image once you have signed the jmods to complete the packaging steps.