fix: downgrade into-stream to 6.0.0 for CommonJS compatibility

[Copilot]

into-stream 9.1.0+ is ESM-only. The pkg codebase compiles TypeScript to CommonJS, causing ERR_REQUIRE_ESM on startup.

Changes

• Downgrade into-stream from ^9.1.0 to ^6.0.0 (last CommonJS version)
• Update yarn.lock accordingly

The API is unchanged between versions for our usage (buffer-to-stream conversion).

Original prompt

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This section details on the original issue you should resolve

<issue_title>Error requiring into-stream on pkg startup</issue_title>
<issue_description>### What version of pkg are you using?

6.14.0

What version of Node.js are you using?

22.4.1

What operating system are you using?

Ubuntu 22.04

What CPU architecture are you using?

x86_64

What Node versions, OSs and CPU architectures are you building for?

node22-linux-x64, node22-win-x64

Describe the Bug

I have to run pkg on node v22.4.1. When I start pkg via npx, I immediately get this error:

$ npx pkg .
<...>/dct2/node_modules/@yao-pkg/pkg/lib-es5/producer.js:315
                    }
             ^

Error [ERR_REQUIRE_ESM]: require() of ES Module <...>/dct2/node_modules/@yao-pkg/pkg/node_modules/into-stream/index.js from <...>/dct2/node_modules/@yao-pkg/pkg/lib-es5/producer.js not supported.
Instead change the require of index.js in <...>/dct2/node_modules/@yao-pkg/pkg/lib-es5/producer.js to a dynamic import() which is available in all CommonJS modules.
    at TracingChannel.traceSync (node:diagnostics_channel:315:14)
    at Object.<anonymous> (<...>/dct2/node_modules/@yao-pkg/pkg/lib-es5/producer.js:11:39) {
  code: 'ERR_REQUIRE_ESM'
}

Node.js v22.4.1

Expected Behavior

pkg starts normally and can be used on node v22.4.1.

To Reproduce

• Use node v22.4.1 (globally or via version manager)
• Install @yao-pkg/pkg locally as dev dependency
• Try npx pkg .

The error occurs regardless of having pkg config in package.json.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Error requiring into-stream on pkg startup #219

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