chore: add Node.js 22.x, 23.x, 24.x, 25.x to CI matrix

[imangas]

Add Node.js 22.x - 25.x to CI matrix

Description

This PR adds support for testing on newer Node.js versions in the CI workflow.

Changes

• Added Node.js 22.x, 23.x, 24.x, and 25.x to the CI test matrix
• No changes to existing version configurations
• Fixed Node.js 0.6 build by adding Ubuntu Bionic GPG key (required after Ubuntu Bionic EOL)

Node.js versions

Version	Status
Node.js 0.6	✅ Fixed (added GPG key)
Node.js 0.8 - 21.x	✅ Unchanged
Node.js 22.x	✨ New
Node.js 23.x	✨ New
Node.js 24.x	✨ New
Node.js 25.x	✨ New

[imangas]

Update

CI coverage for Node.js v0.6 was removed (commented)

Changes

• basic-auth-connect: Extend the GitHub Actions test matrix up to Node.js 25 (including 23/24/25) and ensure each matrix entry defines node-version.
• jshttp-content-type: Comment out all Node.js 0.6-related CI code (the matrix.include entry and the special install/toolchain setup).

Why Node.js 0.6 was removed

Node.js 0.6 is an extremely old runtime and running it in CI requires a dedicated, outdated toolchain/OS package setup. We are disabling it for now so the pipeline remains reliable; re-enabling 0.6 will require revisiting and maintaining that installation path separately.

Notes

• No runtime or API changes — CI-only.