[6.16.z] Do not store extraheader http auth in git config (#16343)

Do not store extraheader http auth in git config (#16339)

(cherry picked from commit 0aa034f)

Co-authored-by: Ondřej Gajdušek <ogajduse@redhat.com>

.github/workflows/update_robottelo_image.yml

@@ -16,6 +16,9 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          # do not store the auth token in git config
+          persist-credentials: false
 
       - name: Get image tag
         id: image_tag