Update circleci/ruby Docker tag to v2.7 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
circleci/ruby	docker	minor	2.6 -> 2.7
circleci/ruby	docker	minor	2.5 -> 2.7

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Renovate configuration

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:recycle: Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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