fix: Build for earlier deployment targets by updating CareKitEssentials

[cbaker6]

• Update to fix: Build for older versions of Xcode CareKitEssentials#33
• Drop deployment targets to minimum supported by CareKitEssentials
• Add back old code

  CareKitSample-ParseCareKit/OCKSample/Main/Care/CustomCards/TipView.swift

  Lines 106 to 111 in cd6d1b7

  	override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
  	super.traitCollectionDidChange(previousTraitCollection)
  	if previousTraitCollection?.preferredContentSizeCategory != traitCollection.preferredContentSizeCategory {
  	imageHeightConstraint.constant = scaledImageHeight(compatibleWith: traitCollection)
  	}
  	}