[wp-trac] [WordPress Trac] #45770: Add back vendor directory to .gitignore

[WordPress Trac]

#45770: Add back vendor directory to .gitignore
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 Reporter:  swissspidy        |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  Build/Test Tools  |    Version:  trunk
 Severity:  normal            |   Keywords:  has-patch
  Focuses:                    |
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 The changes to `.gitignore` in #43411 weren't quite right.

 After adding an entry for `/vendor` in [42405], that was reverted again by
 accident in [43309].

 Long story short: `/vendor` is still missing from `.gitignore`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45770>
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