[MacPorts] #68453: gcc10-bootstrap: update to gcc 10.5

[MacPorts]

#68453: gcc10-bootstrap: update to gcc 10.5
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 Reporter:  barracuda156  |      Owner:  catap
     Type:  update        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:                |       Port:  gcc10-bootstrap
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 gcc 10.5 has been released back in July. Will be great to update to it.

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Ticket URL: <https://trac.macports.org/ticket/68453>
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