Bump requests from 2.26.0 to 2.31.0 in /tools/workflows

Bumps [requests](https://github.com/psf/requests) from 2.26.0 to 2.31.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.26.0...v2.31.0)

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

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

tools/workflows/constraints.txt

@@ -3,6 +3,6 @@ charset-normalizer==2.0.4
 idna==3.2
 junit-xml==1.9
 PyYAML==5.4.1
-requests==2.26.0
+requests==2.31.0
 six==1.16.0
 urllib3==1.26.6

tools/workflows/requirements.txt

@@ -3,6 +3,6 @@ charset-normalizer==2.0.4
 idna==3.2
 junit-xml==1.9
 PyYAML==5.4.1
-requests==2.26.0
+requests==2.31.0
 six==1.16.0
 urllib3==1.26.6