Adopt auth helper 3.0.0

[nawforce]

Summary

Updates @apexdevtools/test-runner to consume @apexdevtools/sfdx-auth-helper@3.0.0 and align its direct Salesforce dependencies with the helper's @salesforce/core@8 runtime stack.

This is expected to be released as a major version because the supported Node.js runtime floor moves to Node 22.13 or newer.

Changes

• Update @apexdevtools/sfdx-auth-helper from ^2.1.1 to ^3.0.0.
• Update @salesforce/core from ^4.3.11 to ^8.32.2.
• Update @salesforce/apex-node from ^1.6.2 to ^8.4.34 so Connection types align with Salesforce core v8.
• Raise engines.node to ^22.13.0 || >=24.
• Replace test-only @salesforce/core/lib/testSetup deep imports with @salesforce/core/testSetup.
• Add a changelog reminder that the next release is expected to be major.

Validation

• pnpm build
• pnpm test
• pnpm lint
• pnpm test:pack
• node test-bundle/bundle.js

The generated bundle executes successfully. Node 24 emits the built-in punycode deprecation warning during bundle execution.