Ajout de timeouts sur toutes les requêtes externes (y compris tests API)

app/entreprises/app_relations_entreprises.py

app/entreprises/forms.py

app/scodoc/sco_dump_db.py

app/scodoc/sco_up_to_date.py

app/scodoc/sco_utils.py

tests/api/exemple-api-scodoc7.py

tests/api/setup_test_api.py

tests/api/test_api_absences.py

tests/api/test_api_departements.py

tests/api/test_api_etudiants.py

tests/api/test_api_evaluations.py

tests/api/test_api_formations.py

tests/api/test_api_formsemestre.py

tests/api/test_api_logos.py

tests/api/test_api_permissions.py

tools/check_network.py