ci(deps): bump SamKirkland/FTP-Deploy-Action from 4.3.4 to 4.3.6

Bumps [SamKirkland/FTP-Deploy-Action](https://github.com/samkirkland/ftp-deploy-action) from 4.3.4 to 4.3.6.
- [Release notes](https://github.com/samkirkland/ftp-deploy-action/releases)
- [Commits](SamKirkland/FTP-Deploy-Action@v4.3.4...v4.3.6)

---
updated-dependencies:
- dependency-name: SamKirkland/FTP-Deploy-Action
  dependency-version: 4.3.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/docs-deploy.yml

@@ -73,7 +73,7 @@ jobs:
       - name: Deploy to Netcup hosting
         # Only deploy if secrets are available
         if: env.NETCUP_URI != '' && env.NETCUP_USER != '' && env.NETCUP_PASSWORD != ''
-        uses: SamKirkland/[email protected].4
+        uses: SamKirkland/[email protected].6
         with:
           server: ${{ env.NETCUP_URI }}
           username: ${{ env.NETCUP_USER }}