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

This fixes builds on JDK 26 for me.

wpiutil/src/main/java/org/wpilib/util/struct/DynamicStruct.java

@@ -378,7 +378,7 @@ public final class DynamicStruct {
    * @throws IllegalArgumentException if field is not a member of this struct
    * @throws IllegalStateException if struct descriptor is invalid
    */
-  @SuppressWarnings({"PMD.CollapsibleIfStatements", "PMD.AvoidDeeplyNestedIfStmts"})
+  @SuppressWarnings("PMD.CollapsibleIfStatements")
   public String getStringField(StructFieldDescriptor field) {
     if (field.getType() != StructFieldType.CHAR) {
       throw new UnsupportedOperationException("field is not char type");

wpiutil/src/test/java/org/wpilib/util/ConstructorMatchTest.java

@@ -11,11 +11,7 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
 import java.util.Optional;
 import org.junit.jupiter.api.Test;
 
-@SuppressWarnings({
-  "PMD.TestClassWithoutTestCases",
-  "PMD.UnusedFormalParameter",
-  "RedundantModifier"
-})
+@SuppressWarnings({"PMD.TestClassWithoutTestCases", "RedundantModifier"})
 class ConstructorMatchTest {
   public static class TestClass {
     public TestClass() {}