Update CHANGELOG-VAADIN8.md (#12584)

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 # Vaadin 8 extended maintenance version changelog
 
-## Vaadin 8.21.0
+## Vaadin 8.20.1
 
 * Fixed a bug in TwinColSelect, which caused incorrect layouting on Firefox on some platforms. The issue was similar to the problem discussed in [#9175](https://github.com/vaadin/framework/issues/9175)
 * Updated `license-checker` to the latest available version for better user experience and MPR compatibility.