devel/mage: Update to 1.15.0
ChangeLog: https://github.com/magefile/mage/releases/tag/v1.15.0
- Update CI
- fix erroneous docstring of sh.Exec()
- Update jQuery to 3.5.0
- -d dir contains magefiles stop with "No .go files marked with the mage build tag..."
- mage: cancel context on SIGINT
PR: 273084
Reported by: gspurki@gmail.com (maintainer)