[MacPorts] #56370: linkchecker: Update to 9.4

[MacPorts]

#56370: linkchecker: Update to 9.4
---------------------------+----------------------------
  Reporter:  jdiamondNYDI  |      Owner:  kurthindenburg
      Type:  update        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  linkchecker   |
---------------------------+----------------------------

Comment (by pmetzger):

 Howdy! Do you think you could do a GitHub pull request with this change?
 Instructions are in the MacPorts guide. Your ticket is likely to be closed
 much faster if you do that.

-- 
Ticket URL: <https://trac.macports.org/ticket/56370#comment:2>
MacPorts <https://www.macports.org/>
Ports system for macOS