Bump requests from 2.28.2 to 2.32.4 in /tests/slo

Bumps [requests](https://github.com/psf/requests) from 2.28.2 to 2.32.4.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.28.2...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>

Author: dependabot[bot]

tests/slo/requirements.txt

@@ -1,4 +1,4 @@
-requests==2.28.2
+requests==2.32.4
 ratelimiter==1.2.0.post0
 prometheus-client==0.17.0
 quantile-estimator==0.1.2