[wpiutil] Deprecate wpi::math constants in favor of wpi::numbers (#3383)

The constants were moved from std::math to std::numbers before
ratification in C++20.

wpilibcExamples/src/main/cpp/examples/DriveDistanceOffboard/include/Constants.h

@@ -9,7 +9,7 @@
 #include <units/time.h>
 #include <units/velocity.h>
 #include <units/voltage.h>
-#include <wpi/math>
+#include <wpi/numbers>
 
 /**
  * The Constants header provides a convenient place for teams to hold robot-wide