Update stewards-update.yml to only make PR with README

Author: ksen0

.github/workflows/stewards-update.yml

@@ -24,6 +24,11 @@ jobs:
       - name: Run table generator
         run: node utils/stewards-table.js
 
+      - name: Reset all changes except README.md
+        run: |
+          git add README.md
+          git restore --source=HEAD .
+        
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v5
         with: