docs: remove outdated license scan badge (mochajs#5167)

Author: JoshuaKGoldberg

README.md

@@ -7,7 +7,6 @@
 <p align="center">
 <a href="https://github.com/mochajs/mocha/actions?query=workflow%3ATests+branch%3Amain"><img src="https://github.com/mochajs/mocha/workflows/Tests/badge.svg?branch=main" alt="GitHub Actions Build Status"></a>
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 <a href="https://github.com/mochajs/mocha#backers"><img src="https://opencollective.com/mochajs/tiers/backers/badge.svg" alt="OpenCollective Backers"></a>