[UBports] New upstream release v0.15.2

UpdateWatchTowerrequested to merge
personal/ubports_uwt_bot/update-0_15_2 into ubports/latest

New upstream release v0.15.2

This updates: from: 0.15.1+really0.15.1 to: 0.15.2

New debian version: 0.15.2-0ubports1

Changes: https://github.com/sailfishos/sensorfw/compare/0.15.1+really0.15.1...0.15.2

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