[wp-trac] [WordPress Trac] #64140: Remove dependabot configuration

[WordPress Trac]

#64140: Remove dependabot configuration
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 Reporter:  desrosj           |      Owner:  (none)
     Type:  task (blessed)    |     Status:  new
 Priority:  normal            |  Milestone:  6.9
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:  has-patch
  Focuses:                    |
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 Since ~February 2024, any branches created by GitHub's Dependabot are
 being deleted when the wordpress-develop repository's Git mirroring script
 runs. The result is that each associated PR is closed, and applying or
 testing any related patch is no longer possible. The side effect is that a
 new PR is created every time Dependabot runs, regardless of whether there
 are updates available.

 Prior to this date, Dependabot worked as expected without branches being
 deleted and PRs remained open. Despite working through this with GitHub,
 the underlying cause of the behavior change is still unknown.

 Until this can be solved, the Dependabot configuration file should be
 removed to avoid unnecessarily running Actions workflows and churning PRs.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64140>
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