🤖 docs(README.md): Fix badges/shields#8671.

These changes were automatically generated by a transform whose code can be found at:
  - https://github.com/make-github-pseudonymous-again/rejuvenate/blob/b27ce6d333a4c46ff5161eaddfbe16895bbabf0f/src/transforms/readme:tests-badge-shields-issue-8671.js
Please contact the author of the transform if you believe there was an error.

README.md

@@ -18,7 +18,7 @@ base64.decode(bytes, {alphabet: 'BCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuv
 
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+[![Tests](https://img.shields.io/github/actions/workflow/status/codec-bytes/base64/ci.yml?branch=main&event=push&label=tests)](https://github.com/codec-bytes/base64/actions/workflows/ci.yml?query=branch:main)
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