[wp-trac] [WordPress Trac] #44457: Rename `upgrade_php` capability to `update_php`

[WordPress Trac]

#44457: Rename `upgrade_php` capability to `update_php`
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 Reporter:  flixos90         |      Owner:  (none)
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  5.0
Component:  Role/Capability  |    Version:  trunk
 Severity:  normal           |   Keywords:  needs-patch servehappy
  Focuses:                   |
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 In today's PHP meeting, we decided to use the term "update" instead of
 "upgrade" throughout. This is in line with how WordPress has commonly used
 only "update", with "upgrade" only appearing sometimes internally in the
 code.

 Similar capabilities are called `update_core`, `update_plugins` etc., so
 our capability should be in line with this too. While we initially
 considered "upgrade" a more fitting term for PHP, eventually consistency
 makes sense here, and users are more familiar already with the term
 "update".

 This is a follow-up to #41191. Since the capability has not been part of
 any WordPress release and has not been used outside of its single use-
 case, we can easily rename it without backward-compatibility implications.

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Ticket URL: <https://core.trac.wordpress.org/ticket/44457>
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