chore: deploy nginx workflow name (#2110)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> Fixes the deploy workflow to trigger the correct `deploy-nginx.yml` in
the private repo.
> 
> - **CI/CD**:
> - In `.github/workflows/deploy-nginx.yml`, update GitHub CLI command
to trigger `deploy-nginx.yml` (was `deploy-nginx.yaml`) in
`apify/apify-docs-private`.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
61deb8e. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: markubra

.github/workflows/deploy-nginx.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
       - name: Trigger deployment workflow in apify-docs-private
         run: |
-          gh workflow run deploy-nginx.yaml \
+          gh workflow run deploy-nginx.yml \
             --repo apify/apify-docs-private \
             --field deployment=apify-docs
           echo "✅ Deployment workflow triggered successfully"