Bump apps/open-source-billing from `e9e3b22` to `7ab5e91`
Bump apps/open-source-billing from `e9e3b22` to `7ab5e91`

Bumps [apps/open-source-billing](https://github.com/vteams/open-source-billing) from `e9e3b22` to `7ab5e91`.
- [Release notes](https://github.com/vteams/open-source-billing/releases)
- [Commits](https://github.com/vteams/open-source-billing/compare/e9e3b22b382c99c00bcb47573b75d6447ee66ded...7ab5e912672fcdb6b72d653ce3480d883b91fda5)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
eliotsykes/real-world-rails