fix (FTS3Agent): fix wrong return type

[chaen]

BEGINRELEASENOTES
*DMS

FIX: fix wrong return type in the FTS3Agent, when using tokens

ENDRELEASENOTES

[DIRACGridBot]

Sweep summary

Sweep ran in https://github.com/DIRACGrid/DIRAC/actions/runs/11476928430

Failed:

• integration
  cherry-pick 96a0647 into integration failed
  check merge conflicts on a local copy of this repository

  git fetch upstream
  git checkout upstream/integration -b cherry-pick-2-96a06472c-integration
  git cherry-pick -x -m 1 96a06472c
  # Fix the conflicts
  git cherry-pick --continue
  git commit --amend -m 'sweep: #7844 fix (FTS3Agent): fix wrong return type' --author='Christophe Haen <[email protected]>'
  git push -u origin cherry-pick-2-96a06472c-integration
  
  # If you have the GitHub CLI installed the PR can be made with
  gh pr create \
       --label 'sweep:from rel-v8r0' \
       --base integration \
       --repo DIRACGrid/DIRAC \
       --title '[sweep:integration] fix (FTS3Agent): fix wrong return type' \
       --body 'Sweep #7844 `fix (FTS3Agent): fix wrong return type` to `integration`.
  
  Adding original author @chaen as watcher.
  
  BEGINRELEASENOTES
  *DMS
  
  FIX: fix wrong return type in the FTS3Agent, when using tokens
  
  ENDRELEASENOTES
  Closes #7849'