Update adoption cases

adoption-cases.md

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+* "[Governing a regional data hub](https://miro.com/app/board/o9J_lw6VYgY=/)," developed by Caroline Paulick-Thiel and Niklas Kossow for the #SmartCityGovernance Track of the Creative Bureaucracy Festival Academy, 2021
 * "[How defining the characteristics of your community can make you more effective](https://grp-bio-it.embl-community.io/blog/posts/2021-08-13-defining-your-community/)," Bio-IT Community Blog (August 13, 2021)
 * [Contributor Covenant GOVERNANCE.md file](https://github.com/EthicalSource/contributor_covenant/commit/980b5e006421fc5d3f0e184eae224fa6f51abb56#diff-b60c6a93e9f74ee52e71bf33781c2870b8395c8c5a34f00f61305343cb8d8447) (May 11, 2020)