Replace tab by spaces.

Author: MJWester1

.github/workflows/cat_src.yml

@@ -32,7 +32,7 @@ jobs:
         git reset --hard origin/main
         git rm -rf .
         git checkout main -- README.md  # Explicitly checkout the latest README.md from main
-	git pull
+        git pull
         git add README.md all_source.txt
         git commit -m "Updating all source and README"