ci: fix - unit-tests job requires persist-credentials: true (deepset-ai#11735)

Author: anakin87

.github/workflows/tests.yml

@@ -131,7 +131,7 @@ jobs:
     steps:
       - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
-          persist-credentials: false
+          persist-credentials: true # needed for python-coverage-comment-action
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with: