[build] Upgrade Gradle plugins (#8166)

I upgraded all plugins I could see except org.ysb33r.doxygen. 2.0 made
breaking changes, and I couldn't figure out how to migrate.

Most of the changes are for suppressing new linter purification rites.

wpiutil/src/main/java/edu/wpi/first/util/cleanup/ReflectionCleanup.java

@@ -11,6 +11,7 @@ import java.lang.reflect.Field;
  * your `close` method, that will use reflection to find all `AutoCloseable` instance members and
  * close them.
  */
+@SuppressWarnings("PMD.ImplicitFunctionalInterface")
 public interface ReflectionCleanup extends AutoCloseable {
   /**
    * Default implementation that uses reflection to find all AutoCloseable fields not marked

wpiutil/src/main/java/edu/wpi/first/util/sendable/Sendable.java

@@ -5,6 +5,7 @@
 package edu.wpi.first.util.sendable;
 
 /** The base interface for objects that can be sent over the network. */
+@SuppressWarnings("PMD.ImplicitFunctionalInterface")
 public interface Sendable {
   /**
    * Initializes this {@link Sendable} object.

wpiutil/src/main/java/edu/wpi/first/util/struct/StructGenerator.java

@@ -435,7 +435,6 @@ public final class StructGenerator {
     }
 
     int size = 0;
-    boolean failed = false;
 
     for (final E constant : enumVariants) {
       final String name = constant.name();
@@ -452,6 +451,8 @@ public final class StructGenerator {
             .filter(f -> !f.isEnumConstant() && !Modifier.isStatic(f.getModifiers()))
             .toList();
 
+    boolean failed = false;
+
     for (final Field field : enumFields) {
       final Class<?> type = field.getType();
       final String name = field.getName();