Allow longer to download nexus package

[alyssaruth]

When downloading the nexus package, this role uses the the ansible built-in for get_url. The default timeout for this is only 10 seconds: https://docs.ansible.com/ansible/latest/collections/ansible/builtin/get_url_module.html#parameter-timeout.

The nexus packages are pretty large - e.g. nexus-3.73.0-12-unix.tar.gz is 236.4 MB. On slower connections, this can easily take longer than 10 seconds to download. I think the default should be higher - e.g. 1 minute - and it could also be exposed as a configuration option alongside the existing nexus_download_retries one.