Support offline mode

Does CyclonDX Maven plugin support offline Maven mode?

I get the following error "Failed to execute goal org.cyclonedx:cyclonedx-maven-plugin:2.7.10:makeAggregateBom (default-cli) on project ...: Goal requires online mode for execution but Maven is currently offline."

Tried to use `-DSPDXParser.OnlyUseLocalLicenses=true`, but it doesn't help.

Start by reproducing the reported failure with the CycloneDX Maven plugin's makeAggregateBom goal while Maven runs offline, then investigate how the plugin handles the existing SPDXParser.OnlyUseLocalLicenses setting. Done means the goal completes successfully in offline mode without requiring network access, with coverage for that scenario.

Written by the indexing model from the issue text.