Remove the dependencies of components removed in Camel 4.23 without a replacement

camel-digitalocean, camel-iec60870, camel-irc, camel-ironmq, camel-json-patch, camel-leveldb, camel-splunk and camel-catalog-lucene were removed in Camel 4.23 without a drop-in replacement, so their dependencies are removed as in earlier releases. Routes using the removed components still need manual migration (camel-splunk-hec is producer-only and is not a drop-in replacement for camel-splunk).