Update requests requirement from <2.21,>=2.6.1 to >=2.6.1,<2.29

Updates the requirements on [requests](https://github.com/psf/requests) to permit the latest version.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.6.1...v2.28.0)

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

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

setup.py

@@ -100,7 +100,7 @@ def get_version(version_file):
         "python-dateutil >= 2.7.5",
         "PyYAML >=4.2b1",
         "redis >= 3.2.0",
-        "requests <2.21,>=2.6.1",
+        "requests >=2.6.1,<2.29",
         "schedule >= 0.4.2",
         "setuptools >= 24.2.0",
         "tqdm >= 4.30.0",