stop using readable-stream

[pirxpilot]

readable-stream is only needed to support node < 18
as documented in package.json we expect node >= 18

[Copilot]

Pull request overview

This PR removes the readable-stream dependency, which was only needed to support Node.js versions prior to 18. Since the project requires Node.js >= 18 (as specified in package.json), the built-in stream module can be used directly instead.

• Removed readable-stream from package dependencies
• Updated imports and type references to use Node.js built-in stream module

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
package.json	Removed the readable-stream dependency from the dependencies list
lib/poparser.js	Updated import statement from readable-stream to stream and updated JSDoc type references to use node:stream

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