⬆ Bump tenacity from 8.5.0 to 9.1.2 in /backend

Bumps [tenacity](https://github.com/jd/tenacity) from 8.5.0 to 9.1.2.
- [Release notes](https://github.com/jd/tenacity/releases)
- [Commits](jd/tenacity@8.5.0...9.1.2)

---
updated-dependencies:
- dependency-name: tenacity
  dependency-version: 9.1.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

backend/pyproject.toml

@@ -8,7 +8,7 @@ dependencies = [
     "python-multipart<1.0.0,>=0.0.7",
     "email-validator<3.0.0.0,>=2.1.0.post1",
     "passlib[bcrypt]<2.0.0,>=1.7.4",
-    "tenacity<9.0.0,>=8.2.3",
+    "tenacity>=8.2.3,<10.0.0",
     "pydantic>2.0",
     "emails<1.0,>=0.6",
     "jinja2<4.0.0,>=3.1.4",