[MacPorts] #63733: trac: update to latest upstream release (1.5.3)

[MacPorts]

#63733: trac: update to latest upstream release (1.5.3)
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 Reporter:  mascguy  |      Owner:  mascguy
     Type:  update   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  trac
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 As an added bonus, the latest release drops support for Python 2.7, in
 favor of 3.5 and later.

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Ticket URL: <https://trac.macports.org/ticket/63733>
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