Bump Node.js to 24 and upgrade actions to Node.js 24 runtimes

[kaxil]

Bump Node.js from 20/21 to 24 across all CI workflows and upgrade actions that were still running on the Node.js 20 runtime. GitHub will force Node.js 24 starting June 2026.

Workflow node-version changes:

• basic-tests.yml: 21 → 24
• ui-e2e-tests.yml: 21 → 24
• registry-build.yml: 20 → 24
• registry-backfill.yml: 20 → 24

Action runtime upgrades (Node.js 20 → 24):

• actions/setup-python: v5.6.0 → v6.2.0 (in .github/actions/breeze/action.yml)
• pnpm/action-setup: already at v5.0.0 on main

Automated upgrade script:

• upgrade_important_versions.py: LTS prefix v22 → v24

All package.json engine fields already require >=22, so Node 24 satisfies them.

[jason810496]

I double checked the setup-python commit hash, LGTM, thanks!

[amoghrajesh]

LGTM

[potiuk]

Oh.. You beat me to it :)

[potiuk]

Compat tests fixed separately in #64020

[github-actions]

Backport failed to create: v3-1-test. View the failure log Run details

Note: As of Merging PRs targeted for Airflow 3.X
the committer who merges the PR is responsible for backporting the PRs that are bug fixes (generally speaking) to the maintenance branches.

In matter of doubt please ask in #release-management Slack channel.

Status	Branch	Result
❌	v3-1-test

You can attempt to backport this manually by running:

cherry_picker 39e01a2 v3-1-test

This should apply the commit to the v3-1-test branch and leave the commit in conflict state marking
the files that need manual conflict resolution.

After you have resolved the conflicts, you can continue the backport process by running:

cherry_picker --continue

If you don't have cherry-picker installed, see the installation guide.