[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:
Resolution:                |   Keywords:
      Port:  leiningen     |
---------------------------+--------------------
Description changed by chrstphrchvz:

Old description:

> 2.9.1 was released 2019-02-26; current version in MacPorts is 2.6.1
> (released 2016).

New description:

 2.9.1 was released 2019-02-26; current version in MacPorts is 2.6.1
 (released 2016).

 When updating, the port may want to be moved away from using `maven2`,
 which is EOL.

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Ticket URL: <https://trac.macports.org/ticket/59684#comment:1>
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