Update forgotten repository-dispatch action to version 4

Author: kdambekalns

.github/workflows/docker.build.yaml

@@ -91,7 +91,7 @@ jobs:
     needs: build
     steps:
       - name: Dispatch to beach-php
-        uses: peter-evans/repository-dispatch@v3
+        uses: peter-evans/repository-dispatch@v4
         with:
           token: ${{ secrets.FLOWNATIVE_BOT_TOKEN }}
           repository: flownative/docker-beach-php