[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/MecanumControllerCommand/include/Constants.h

@@ -12,7 +12,7 @@
 #include <units/time.h>
 #include <units/velocity.h>
 #include <units/voltage.h>
-#include <wpi/math>
+#include <wpi/numbers>
 
 #pragma once
 
@@ -51,7 +51,8 @@ constexpr int kEncoderCPR = 1024;
 constexpr double kWheelDiameterMeters = .15;
 constexpr double kEncoderDistancePerPulse =
     // Assumes the encoders are directly mounted on the wheel shafts
-    (kWheelDiameterMeters * wpi::math::pi) / static_cast<double>(kEncoderCPR);
+    (kWheelDiameterMeters * wpi::numbers::pi) /
+    static_cast<double>(kEncoderCPR);
 
 // These are example values only - DO NOT USE THESE FOR YOUR OWN ROBOT!
 // These characterization values MUST be determined either experimentally or