ci: fix documentation build for new patches

curl command was not alligned with the ci-docker-build.yml workflow, so
it was failing due to HTTP request error.

Reviewed-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>

Author: acerv

.github/workflows/ci-sphinx-doc.yml

@@ -46,7 +46,7 @@ jobs:
           git config --global --add safe.directory "$GITHUB_WORKSPACE"
 
           git checkout -b review_patch_series_"${{ inputs.SERIES_ID }}"
-          curl -k "${{ inputs.SERIES_MBOX }}" | git am
+          curl -k -L --retry 3 --max-redirs 1 --location-trusted "${{ inputs.SERIES_MBOX }}" | git am
 
           ./ci/tools/patchwork.sh state "${{ inputs.SERIES_ID }}" "needs-review-ack"