Bump requests from 2.25.1 to 2.31.0 in /docker/machine/files

Bumps [requests](https://github.com/psf/requests) from 2.25.1 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@v2.25.1...v2.31.0)

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

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

docker/machine/files/requirements.txt

@@ -7,6 +7,6 @@ matplotlib==3.5.3
 mlxtend==0.16.0
 pydot==1.4.2
 simplejson==3.17.2
-requests==2.25.1
+requests==2.31.0
 xgboost==1.6.2
 joblib==1.2.0