ci: run git diff

Author: PROFeNoM

.github/workflows/aggregate_tested_versions.yml

@@ -42,4 +42,7 @@ jobs:
         run: php ./.github/scripts/generate_markdown.php
 
       - name: Show Markdown Table
-        run: cat ./integration_versions.md
+        run: cat ./integration_versions.md
+
+      - name: Show changes
+        run: git diff