[MacPorts] #61980: port lint --nitpick gives false warning when version is a single integer and python PortGroup is used

[MacPorts]

#61980: port lint --nitpick gives false warning when version is a single integer
and python PortGroup is used
--------------------+--------------------
 Reporter:  Tatsh   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  base    |    Version:
 Keywords:          |       Port:
--------------------+--------------------
 I made a Portfile for pyproject2setuppy which uses single integer
 versions: https://pypi.org/project/pyproject2setuppy/#history

 I set this version in the Portfile in the `version` field as usual, and I
 set `python.versions ...`. This seems to confuse `port lint --nitpick`:

 {{{
 Warning: Line 18 seems to hardcode the version number, consider using
 ${version} instead
 }}}

 If I put a 'normal' version string like `9.0`, the warning does not
 appear.

 Portfile before workaround:
 https://github.com/Tatsh/ports/blob/0ac5a6fb6f4c39bec98e5c52938b1895ce84c156/python
 /py-pyproject2setuppy/Portfile

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Ticket URL: <https://trac.macports.org/ticket/61980>
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