Resolve "Unbreak CI due to bad upstream release in PHPStan or `shipmonk/dead-code-detector`"

Wim Leersrequested to merge
issue/canvas-3591759:3591759-update-phpstan-and-shipmonkdead-code-detector into 1.x

See issue. AI-Generated: No

Testing instructions

  • Green on CI
  • Green locally

Closes #3591759 (closed)

Edited by Wim Leers

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