Update dependency workerpool to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
workerpool	^6.1.4 -> ^9.0.0

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Release Notes

josdejong/workerpool (workerpool)

v9.1.0

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• Support capturing the stdout/stderr streams from the workers (#​425, #​423).
  Thanks @​cpendery.

v9.0.4

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• Improve the logic to detect the Node.js platform (#​421). Thanks @​tamuratak.

v9.0.3

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• Improve types: unwrap Promise types (#​419). Thanks @​joshkel.

v9.0.2

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• Export the Proxy type (see #​417). Thanks @​tamuratak.
• Use workerpool's Promise type definition (see #​417). Thanks @​tamuratak.

v9.0.1

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• Export the types Pool, WorkerPoolOptions, and WorkerRegisterOptions,
  see #​416. Thanks @​joshkel.

v9.0.0

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BREAKING CHANGE: the library now comes with TypeScript type definitions
included. There may be minor differences between the new, embedded type
definitions and the implementation from @types/workerpool that was needed
before. For example, type WorkerPool is called type Pool now.

• Generate TypeScript types from JSDoc comments. Thanks @​tamuratak.

v8.0.0

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BREAKING CHANGE: the library now throws an Error when passing unknown or
inherited properties for workerOpts, workerThreadOpts and forkOpts.

• Fix: throw an error in case of unknown properties or inherited properties
  in workerOpts, workerThreadOpts and forkOpts to protect against
  security issues related to prototype pollution
  (see ea5368c).
• Fix: #​56 document the return type of all functions.
• Docs: added a full usage example with Vite and Webpack5 (#​408),
  thanks @​KonghaYao.

v7.0.0

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BREAKING CHANGE: The setup to bundle workerpool has been replaced. This should
be a drop-in replacement, but it may have impact depending on your setup.

• Switched build setup from Webpack to Rollup, see #​403. Thanks @​KonghaYao.

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