Bump stripe from 13.0.1 to 13.1.1 in /requirements

Bumps [stripe](https://github.com/stripe/stripe-python) from 13.0.1 to 13.1.1.
- [Release notes](https://github.com/stripe/stripe-python/releases)
- [Changelog](https://github.com/stripe/stripe-python/blob/master/CHANGELOG.md)
- [Commits](stripe/stripe-python@v13.0.1...v13.1.1)

---
updated-dependencies:
- dependency-name: stripe
  dependency-version: 13.1.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/common.txt

@@ -20,5 +20,5 @@ pykismet3==0.1.1
 requests==2.32.5
 sorl-thumbnail==12.11.0
 Sphinx==8.1.3
-stripe==13.0.1
+stripe==13.1.1
 time-machine==2.19.0