Update Ilshidur/action-discord action to v0.4.0 (#194)

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

Author: renovate[bot]

.github/workflows/announce-release-on-discord.yml

@@ -10,7 +10,7 @@ jobs:
         env:
           DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
           DISCORD_USERNAME: Plot2Dynmap Release
-        uses: Ilshidur/action-discord@0.3.2
+        uses: Ilshidur/action-discord@0.4.0
         with:
           args: |
             "<@&673138796690276352>"