[GRASS-git] [OSGeo/grass] 4df3e1: CI(deps): Update alpine Docker tag to v3.21

[renovate[bot]]

  Branch: refs/heads/renovate/alpine-3.x
  Home:   https://github.com/OSGeo/grass
  Commit: 4df3e1eb1a79a4c88a87f9ce8432648c82712c87
      https://github.com/OSGeo/grass/commit/4df3e1eb1a79a4c88a87f9ce8432648c82712c87
  Author: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
  Date:   2024-12-06 (Fri, 06 Dec 2024)

  Changed paths:
    M docker/alpine/Dockerfile

  Log Message:
  -----------
  CI(deps): Update alpine Docker tag to v3.21



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