[GRASS-git] [OSGeo/grass] d3541e: Update docker/build-push-action action to v4 (#2796)

[renovate[bot]]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: d3541e019dd9c780392bae6f4aeaf06c82d8a220
      https://github.com/OSGeo/grass/commit/d3541e019dd9c780392bae6f4aeaf06c82d8a220
  Author: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
  Date:   2023-02-08 (Wed, 08 Feb 2023)

  Changed paths:
    M .github/workflows/docker.yml

  Log Message:
  -----------
  Update docker/build-push-action action to v4 (#2796)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>