[MacPorts] #61810: certbot and subports set dependencies incorrectly with most variants

[MacPorts]

#61810: certbot and subports set dependencies incorrectly with most variants
--------------------+-------------------------
 Reporter:  jmroot  |      Owner:  Schamschula
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  certbot
--------------------+-------------------------
 Dependencies are being set before the variants are executed, which means
 python.version has a fixed value. E.g.
 {{{
 % port deps certbot +python38
 Full Name: certbot @1.10.1_0+python38
 Build Dependencies:   py39-setuptools
 Library Dependencies: py39-acme, py39-configargparse, py39-configobj,
                       py39-cryptography, py39-distro, py39-future,
                       py39-google-api, py39-httplib2, py39-mock,
                       py39-oauth2client, py39-openssl, py39-parsedatetime,
                       py39-psutil, py39-pyrfc3339, py39-six, py39-tz,
                       py39-zope-component, py39-zope-deferredimport,
                       py39-zope-deprecation, py39-zope-hookable, python38
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61810>
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