Update package manager to the latest 9.x version (9.15.5)

[dobrac]

This PR updates the packageManager field in package.json to the latest 9.x version release (9.15.5).

Currently the specified version 8.x is invalid with the configuration limit for engine:

"engines": {
    "pnpm": ">=9.0.0 <10"
  } 

[changeset-bot]

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Latest commit: c108afb

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