Update dependency renovate to v19.66.15

This MR contains the following updates:

Package	Type	Update	Change	References
renovate	devDependencies	patch	19.66.14 -> 19.66.15	homepage, source

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Release Notes

renovatebot/renovate

v19.66.15

Compare Source

Bug Fixes

• azure: remove 'refs/heads/' from target branch (#​4820) (67d82c5), closes #​4812

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