[GRASS-git] [OSGeo/grass] abcba9: CI: simplify Windows setup yaml file (#2861)

[Nicklas Larsson]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: abcba9a65659a3e1053f1a75e2c1b22916131a8c
      https://github.com/OSGeo/grass/commit/abcba9a65659a3e1053f1a75e2c1b22916131a8c
  Author: Nicklas Larsson <n_larsson at yahoo.com>
  Date:   2023-02-26 (Sun, 26 Feb 2023)

  Changed paths:
    M .github/workflows/osgeo4w.yml

  Log Message:
  -----------
  CI: simplify Windows setup yaml file (#2861)

Change to multiline string type (literal) with no need of the somewhat
ambiguous use of blank lines as line brake.