Prepare release version 6.1.0

Prepare release version 6.0.1

Add link to 6.0.0rc1 changelog

Remove duplicated users from release announcement

Preparing release version 4.6.11

Preparing release version 5.4.3

Preparing release version 5.4.2

Introduce missing remark as commented in original PR

https://github.com/pytest-dev/pytest/pull/6870/files#r390667966

Preparing release version 5.4.1