build(deps): bump requests from 2.26.0 to 2.27.1 in /requirements

Bumps [requests](https://github.com/psf/requests) from 2.26.0 to 2.27.1.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.26.0...v2.27.1)

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

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

requirements/requirements-ci.txt

@@ -627,7 +627,7 @@ raiden-contracts==0.40.3
     # via -r requirements-dev.txt
 raiden-webui==1.2.1
     # via -r requirements-dev.txt
-requests==2.26.0
+requests==2.27.1
     # via
     #   -r requirements-dev.txt
     #   grequests

requirements/requirements-dev.txt

@@ -531,7 +531,7 @@ raiden-contracts==0.40.3
     # via -r requirements.txt
 raiden-webui==1.2.1
     # via -r requirements.txt
-requests==2.26.0
+requests==2.27.1
     # via
     #   -r requirements.txt
     #   grequests

requirements/requirements-docs.txt

@@ -37,7 +37,7 @@ pytz==2019.1
     # via babel
 releases==1.6.3
     # via -r requirements-docs.in
-requests==2.26.0
+requests==2.27.1
     # via
     #   sphinx
     #   sphinxcontrib-images

requirements/requirements.txt

@@ -236,7 +236,7 @@ raiden-contracts==0.40.3
     # via -r requirements.in
 raiden-webui==1.2.1
     # via -r requirements.in
-requests==2.26.0
+requests==2.27.1
     # via
     #   -r requirements.in
     #   ipfshttpclient