[wp-trac] [WordPress Trac] #61329: Pin highest supported PHP version in `.env` for 6.5 branch

[WordPress Trac]

#61329: Pin highest supported PHP version in `.env` for 6.5 branch
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 Reporter:  desrosj           |      Owner:  desrosj
     Type:  task (blessed)    |     Status:  assigned
 Priority:  normal            |  Milestone:  6.6
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 When a fresh branch for a new release is created, the value of `LOCAL_PHP`
 in the `.env` file should be changed from `latest` (or whatever the value
 in `trunk` was at the time) to the highest version of PHP supported by
 that version.

 This prevents test workflows and the local development environment from
 breaking in the future when the container tagged `latest` changes to a
 newer version of PHP.

 It looks like this was missed during the 6.5 branching.

 Previously #60095.

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Ticket URL: <https://core.trac.wordpress.org/ticket/61329>
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