feat!: remove Node 20 support

[pacostas]

Summary

Updates Node.js version support to align with current LTS releases.

Changes

• Removed: Node.js 20 support
• Added: Node.js 26 to CI matrix
• Updated: Minimum engine requirement from >=20 to >=22
• Updated: Release workflow to use Node.js 22 (from 16)
• Updated: README prerequisites to reflect Node.js 22.x minimum

Current Active LTS Versions

• Node.js 22 (Jod)
• Node.js 24 (Krypton)
• Node.js 26

All tests pass with the updated configuration.

[lholmquist]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[richardlau]

• Node.js 26

Note that Node.js 26 does not become LTS until October.

[pacostas]

Note that Node.js 26 does not become LTS until October.

I agree, it practically tests the npm package against it, so is just an extra test in our case

[pacostas]

Btw, i override it accidentaly, so Im adding it on this PR #233