Guess forked actions aren't a thing, downgrade FTP for now

.github/workflows/docfx.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Build DocFX
         run: docfx docfx/docfx_project/docfx.json
       - name: Upload to FTP
-        uses: maverage/FTP-Deploy-Action@4.3.5
+        uses: SamKirkland/FTP-Deploy-Action@4.3.4
         with:
           server: www360.your-server.de
           protocol: ftps