chore: really fix autoupdate workflow to avoid useless PRs

.github/workflows/autoupdate.yml

@@ -18,7 +18,7 @@ jobs:
         id: diff
         run: |
           echo change="$(git diff spectre-meltdown-checker.sh | awk '/MCEDB/ { if(V) { print V" to "$4; exit } else { V=$4 } }')" >> "$GITHUB_OUTPUT"
-          echo nbdiff="$(git diff --numstat spectre-meltdown-checker.sh | awk '{print $1}')" >> "$GITHUB_OUTPUT"
+          echo nbdiff="$(git diff spectre-meltdown-checker.sh | grep -cE -- '^\+# [AI],')" >> "$GITHUB_OUTPUT"
           git diff
           cat "$GITHUB_OUTPUT"
       - name: Create Pull Request if needed