[MacPorts] #59684: leiningen: update to 2.9.1

[MacPorts]

#59684: leiningen: update to 2.9.1
--------------------------+-----------------------
 Reporter:  chrstphrchvz  |      Owner:  (none)
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  leiningen
--------------------------+-----------------------
 2.9.1 was released 2019-02-26; current version in MacPorts is 2.6.1
 (released 2016).

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Ticket URL: <https://trac.macports.org/ticket/59684>
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