Update dependency renovate to ^21.13.3

This MR contains the following updates:

Package	Type	Update	Change
renovate (source)	dependencies	patch	^21.13.2 -> ^21.13.3

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

renovatebot/renovate

v21.13.3

Compare Source

21.13.3 (2020-06-22)

Bug Fixes

• bundler: don't log error when Gemfile is invalid (#​6557) (97665c4)

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This MR has been generated by Renovate Bot.