Add modification date to privacy policy #1160

Job	Run time
Check & Compile	5m 27s
WPILib: Build for Linux (x64)	1m 21s
Build for macOS (x64)	3m 19s
Build for Windows (x64)	6m 30s
WPILib: Build for Linux (arm64)	1m 14s
Build for Linux/AppImage (x64)	2m 5s
Build for macOS (arm64)	2m 29s
Build for Windows (arm64)	9m 0s
Build for Linux/AppImage (arm64)	1m 45s
Build for Linux/AppImage (armv7l)	1m 36s
WPILib: Build for macOS (x64)	2m 30s
WPILib: Build for Windows (x64)	6m 14s
WPILib: Build for macOS (arm64)	2m 18s
WPILib: Build for Windows (arm64)	6m 19s
Finalize Release	0s
	52m 7s

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