[InterNetNews/inn] 56845b: Update GitHub Actions checkout from v4 to v 6

[Christian Clauss]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 56845b41a4548867a60406e33296ec4ec8559dbe
      https://github.com/InterNetNews/inn/commit/56845b41a4548867a60406e33296ec4ec8559dbe
  Author: Christian Clauss <cclauss at me.com>
  Date:   2026-05-30 (Sat, 30 May 2026)

  Changed paths:
    M .github/workflows/build.yaml

  Log Message:
  -----------
  Update GitHub Actions checkout from v4 to v 6

https://github.com/actions/checkout/releases is currently v6.0.2

Why: Stop building on EOL versions of Node.js.

Fixes: Annotation on https://github.com/InterNetNews/inn/actions/runs/26530786871/job/78146587295

> Node.js 20 actions are deprecated. The following actions
are running on Node.js 20 and may not work as expected:
actions/checkout at v4. Actions will be forced to run with Node.js 24
by default starting June 2nd, 2026. Node.js 20 will be removed from
the runner on September 16th, 2026. Please check if updated versions
of these actions are available that support Node.js 24. To opt into
Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true
environment variable on the runner or in your workflow file. Once
Node.js 24 becomes the default, you can temporarily opt out by
setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For
more information, see:
https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners

close #343



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