Release calendar 5.2.0, 5.3.0, 5.4.0, 5.5.0, 5.6.0

https://docs.google.com/spreadsheets/d/1jEO5gArDZ6tvYdXpQM4VLVITYQaFOjNLG-JcYRIh_Jo/edit#gid=995731450

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