[buddypress-trac] [BuddyPress Trac] #8420: Update/modernize composer.json file

[buddypress-trac]

#8420: Update/modernize composer.json file
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 Reporter:  slaFFik  |      Owner:  slaFFik
     Type:  task     |     Status:  assigned
 Priority:  normal   |  Milestone:  8.0.0
Component:  Core     |    Version:
 Severity:  normal   |   Keywords:
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 Add `config.platform.php`, update `require.php`, add some additional
 params.

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Ticket URL: <https://buddypress.trac.wordpress.org/ticket/8420>
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