Update wpilib version

Author: linkkowalski

build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id "java"
-    id "edu.wpi.first.GradleRIO" version "2021.2.1"
+    id "edu.wpi.first.GradleRIO" version "2021.3.1"
     id "org.jetbrains.kotlin.jvm" version "1.5.20"
     id "idea"
     id "com.diffplug.gradle.spotless" version "3.24.2"