Update dependency renovate to ^21.33.15

This MR contains the following updates:

Package	Type	Update	Change
renovate (source)	dependencies	patch	^21.33.14 -> ^21.33.15

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

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Release Notes

renovatebot/renovate

v21.33.15

Compare Source

21.33.15 (2020-07-22)

Bug Fixes

• migrate string to boolean for masterIssue (d3ce8d7), closes #​6819

Code Refactoring

• remove unnecessary if from git.setBranch (#​6815) (67a7dd4)

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This MR has been generated by Renovate Bot.