Bump simplesamlphp/simplesamlphp from 2.1.3 to 2.2.1

Bumps [simplesamlphp/simplesamlphp](https://github.com/simplesamlphp/simplesamlphp) from 2.1.3 to 2.2.1.
- [Release notes](https://github.com/simplesamlphp/simplesamlphp/releases)
- [Changelog](https://github.com/simplesamlphp/simplesamlphp/blob/v2.2.1/docs/simplesamlphp-changelog.md)
- [Commits](simplesamlphp/simplesamlphp@v2.1.3...v2.2.1)

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

Signed-off-by: dependabot[bot] <[email protected]>