build(deps): bump django from 5.0.7 to 5.1 in /backend

[dependabot[bot]]

Bumps django from 5.0.7 to 5.1.

Commits

• 373cb30 [5.1.x] Bumped version for 5.1 release.
• 8baab82 [5.1.x] Finalized release notes for Django 5.1.
• d5ad743 [5.1.x] Fixed i18n.tests.TranslationTests.test_plural to use correct French t...
• 380c6e6 [5.1.x] Updated translations from Transifex.
• d787e44 [5.1.x] Added CVE-2024-41989, CVE-2024-41990, CVE-2024-41991, and CVE-2024-42...
• e2583fb [5.1.x] Fixed CVE-2024-42005 -- Mitigated QuerySet.values() SQL injection att...
• bd807c0 [5.1.x] Fixed CVE-2024-41991 -- Prevented potential ReDoS in django.utils.htm...
• 0c1a890 [5.1.x] Fixed CVE-2024-41990 -- Mitigated potential DoS in urlize and urlizet...
• 0504af6 [5.1.x] Fixed CVE-2024-41989 -- Prevented excessive memory consumption in flo...
• 2ba4f4b [5.1.x] Fixed #35657 -- Made FileField handle db_default values.
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