net-mgmt/rubygem-oxidized: Fix after updating devel/rubygem-syslog to 0.4.0

The service oxidized encounters the fault:

/usr/local/lib/ruby/site_ruby/3.3/rubygems/specification.rb:1417:in
`block in activate_dependencies': Could not find 'syslog' (~> 0.3.0)
among 25 total gem(s) (Gem::MissingSpecError)

after updating devel/rubygem-syslog to 0.4.0.

Manually patching the gemspec for syslog resolves the issue.
Relax the dependency to allow versions above and including
rubygem-syslog 0.3.0.

PR: 292929