Git pull docs before updating (#18163)

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

.github/workflows/docs.yml

@@ -99,6 +99,7 @@ jobs:
           if git diff --staged --quiet; then
             echo "No changes to commit"
           else
+            git pull origin gh-pages
             LATEST_HASH=$(git rev-parse --short=7 HEAD)
             git commit -m "Update Docs for 'ultralytics ${{ steps.check_pypi.outputs.version }} - $LATEST_HASH'"
             git push https://${{ secrets._GITHUB_TOKEN }}@github.com/ultralytics/docs.git gh-pages