Ruby 2.7.7 is the default
What does this MR do and why?
This MR updates the default Ruby version to be 2.7.7 so we're consistent with other GitLab Ruby projects.
Expected impact & dry-runs
These are strongly recommended to assist reviewers and reduce the time to merge your change.
See https://gitlab.com/gitlab-org/quality/triage-ops/-/tree/master/doc/scheduled#testing-with-a-dry-run on how to perform dry-runs.
Action items
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(If applicable) Add documentation to the handbook pages for Triage Operations => - (If applicable) Identify the affected groups and how to communicate to them:
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/cc @ person_or_group
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Relevant Slack channels => -
Engineering week-in-review
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