Bump requests from 2.27.1 to 2.28.1

Bumps [requests](https://github.com/psf/requests) from 2.27.1 to 2.28.1.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.27.1...v2.28.1)

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

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

Author: dependabot[bot]

requirements.txt

@@ -12,7 +12,7 @@ python-dotenv==0.20.0
 python-telegram-bot==13.12
 Pillow==9.1.1
 PyPDF2==1.28.2
-requests==2.27.1
+requests==2.28.1
 slackclient==2.9.4
 textblob==0.17.1
 WeasyPrint==55.0