Bump requests from 2.32.3 to 2.32.4 in /testing

Bumps [requests](https://github.com/psf/requests) from 2.32.3 to 2.32.4.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](https://github.com/psf/requests/compare/v2.32.3...v2.32.4)

---
updated-dependencies:
- dependency-name: requests
  dependency-version: 2.32.4
  dependency-type: direct:production
...

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

testing/requirements.txt

@@ -24,4 +24,4 @@ git+https://github.com/coinkite/bsms-bitcoin-secure-multisig-setup.git@master#eg
 git+https://github.com/coinkite/BBQr.git@master#egg=bbqr&subdirectory=python
 
 # for backend testing
-requests==2.32.3
+requests==2.32.4