Bump regex from 2024.11.6 to 2025.7.34 (#2701)

Bumps [regex](https://github.com/mrabarnett/mrab-regex) from 2024.11.6 to 2025.7.34.
- [Changelog](https://github.com/mrabarnett/mrab-regex/blob/hg/changelog.txt)
- [Commits](mrabarnett/mrab-regex@2024.11.6...2025.7.34)

---
updated-dependencies:
- dependency-name: regex
  dependency-version: 2025.7.34
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

@@ -366,7 +366,7 @@ quart==0.20.0
     #   quart-cors
 quart-cors==0.7.0
     # via -r requirements.in
-regex==2024.11.6
+regex==2025.7.34
     # via tiktoken
 requests==2.32.4
     # via