Fix syntax error in yaml

Author: hansthen

.github/workflows/freeze-versions.yml

@@ -38,10 +38,10 @@ jobs:
     - name: Freeze versions
       run: |
         python -m pip freeze > frozen_versions.txt
-	git config --local user.email "test@github.com"
-	git config --local user.name "GitHub Action test"
-	git add ./frozen_versions.txt
-	git commit -m "store versions for later reference"
+        git config --local user.email "test@github.com"
+        git config --local user.name "GitHub Action test"
+        git add ./frozen_versions.txt
+        git commit -m "store versions for later reference"
 
     - name: Push changes # push the output folder to your repo
       uses: ad-m/github-push-action@master