build(deps): bump stripe from 18.5.0 to 20.4.1 in /server

Bumps [stripe](https://github.com/stripe/stripe-node) from 18.5.0 to 20.4.1.
- [Release notes](https://github.com/stripe/stripe-node/releases)
- [Changelog](https://github.com/stripe/stripe-node/blob/master/CHANGELOG.md)
- [Commits](stripe/stripe-node@v18.5.0...v20.4.1)

---
updated-dependencies:
- dependency-name: stripe
  dependency-version: 20.4.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]