Release procedure does not add new version in CHANGES.txt in master [LUCENE-8923]

This issue is just to track something that maybe missing in the release procedure. It currently adds a new version on CHANGES.txt in the minor version branch but it does not do it in master.

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Migrated from [LUCENE-8923](https://issues.apache.org/jira/browse/LUCENE-8923) by Ignacio Vera (@iverase)
Attachments: [LUCENE-8923.patch](https://apache.github.io/lucene-jira-archive/attachments/LUCENE-8923/LUCENE-8923.patch)

Start by reading the release procedure and the CHANGES.txt update described in the issue, then inspect the attached LUCENE-8923.patch for prior context. Confirm how the minor version branch is updated and determine the equivalent master behavior; done means a release adds the new version to CHANGES.txt in master as well.

Written by the indexing model from the issue text.