[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/SwerveDrivePoseEstimator/include/Drivetrain.h

@@ -9,7 +9,7 @@
 #include <frc/geometry/Translation2d.h>
 #include <frc/kinematics/SwerveDriveKinematics.h>
 #include <frc/kinematics/SwerveDriveOdometry.h>
-#include <wpi/math>
+#include <wpi/numbers>
 
 #include "SwerveModule.h"
 
@@ -27,7 +27,7 @@ class Drivetrain {
 
   static constexpr auto kMaxSpeed = 3.0_mps;  // 3 meters per second
   static constexpr units::radians_per_second_t kMaxAngularSpeed{
-      wpi::math::pi};  // 1/2 rotation per second
+      wpi::numbers::pi};  // 1/2 rotation per second
 
  private:
   frc::Translation2d m_frontLeftLocation{+0.381_m, +0.381_m};