deps: update dependency markupsafe to v2.1.1 (#18)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [markupsafe](https://palletsprojects.com/p/markupsafe/) ([changelog](https://markupsafe.palletsprojects.com/changes/)) | `==2.0.1` -> `==2.1.1` | [![age](https://badges.renovateapi.com/packages/pypi/markupsafe/2.1.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/markupsafe/2.1.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/markupsafe/2.1.1/compatibility-slim/2.0.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/markupsafe/2.1.1/confidence-slim/2.0.1)](https://docs.renovatebot.com/merge-confidence/) |

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