[build] Upgrade Gradle wrapper and plugins (#8767)

This fixes builds on JDK 26 for me.

wpimath/src/main/java/org/wpilib/math/autodiff/Slice.java

@@ -7,7 +7,6 @@ package org.wpilib.math.autodiff;
 import java.util.OptionalInt;
 
 /** Represents a sequence of elements in an iterable object. */
-@SuppressWarnings("PMD.UnusedFormalParameter")
 public class Slice {
   /** Type tag used to designate an omitted argument of the slice. */
   public static class None {

wpimath/src/main/java/org/wpilib/math/autodiff/Variable.java

@@ -54,7 +54,7 @@ public class Variable implements AutoCloseable {
    * @param handleTypeTag Handle type tag.
    * @param handle Variable handle.
    */
-  @SuppressWarnings({"PMD.UnusedFormalParameter", "this-escape"})
+  @SuppressWarnings("this-escape")
   public Variable(Handle handleTypeTag, long handle) {
     m_handle = handle;
     VariablePool.register(this);

wpimath/src/main/java/org/wpilib/math/estimator/PoseEstimator.java

@@ -68,7 +68,6 @@ public class PoseEstimator<T> {
    *     in meters, y position in meters, and heading in radians). Increase these numbers to trust
    *     the vision pose measurement less.
    */
-  @SuppressWarnings("PMD.UnusedFormalParameter")
   public PoseEstimator(
       Kinematics<T, ?, ?> kinematics,
       Odometry<T> odometry,

wpimath/src/main/java/org/wpilib/math/estimator/PoseEstimator3d.java

@@ -75,7 +75,6 @@ public class PoseEstimator3d<T> {
    *     in meters, y position in meters, z position in meters, and angle in radians). Increase
    *     these numbers to trust the vision pose measurement less.
    */
-  @SuppressWarnings("PMD.UnusedFormalParameter")
   public PoseEstimator3d(
       Kinematics<T, ?, ?> kinematics,
       Odometry3d<T> odometry,