Bump tenacity from 9.0.0 to 9.1.2 (#2700)

Bumps [tenacity](https://github.com/jd/tenacity) from 9.0.0 to 9.1.2.
- [Release notes](https://github.com/jd/tenacity/releases)
- [Commits](jd/tenacity@9.0.0...9.1.2)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Pamela Fox <pamelafox@microsoft.com>

Author: dependabot[bot]

app/backend/requirements.txt

@@ -394,7 +394,7 @@ std-uritemplate==2.0.5
     # via microsoft-kiota-abstractions
 taskgroup==0.2.2
     # via hypercorn
-tenacity==9.0.0
+tenacity==9.1.2
     # via -r requirements.in
 tiktoken==0.8.0
     # via