Fix case sensitivity in README file addition for consistency

.gitea/workflows/update.yaml

@@ -23,5 +23,5 @@ jobs:
         run: |
           git config --local user.email "action@gitea.com"
           git config --local user.name "Gitea Action"
-          git add README.md
+          git add README.MD
           git diff --quiet && git diff --staged --quiet || (git commit -m "Update profile stats" && git push)