Use wpilib.robot instead of frc.robot (#8345)

benchmark/build.gradle

@@ -32,7 +32,7 @@ ext {
 apply from: "${rootDir}/shared/opencv.gradle"
 
 application {
-    mainClass = 'frc.robot.Main'
+    mainClass = 'wpilib.robot.Main'
 }
 
 apply plugin: 'com.gradleup.shadow'

benchmark/src/main/java/wpilib/robot/Main.java

@@ -2,7 +2,7 @@
 // Open Source Software; you can modify and/or share it under the terms of
 // the WPILib BSD license file in the root directory of this project.
 
-package frc.robot;
+package wpilib.robot;
 
 import java.util.concurrent.TimeUnit;
 import org.openjdk.jmh.annotations.Benchmark;