Add more nullability annotations to core/spring-boot

See gh-46587

Author: mhalbritter

core/spring-boot/src/main/java/org/springframework/boot/web/servlet/AbstractFilterRegistrationBean.java

@@ -197,7 +197,7 @@ public void setDispatcherTypes(DispatcherType first, DispatcherType... rest) {
 	 * Sets the dispatcher types that should be used with the registration.
 	 * @param dispatcherTypes the dispatcher types
 	 */
-	public void setDispatcherTypes(EnumSet<DispatcherType> dispatcherTypes) {
+	public void setDispatcherTypes(@Nullable EnumSet<DispatcherType> dispatcherTypes) {
 		this.dispatcherTypes = dispatcherTypes;
 	}