Remove BaseDefaultCodecs#synchronossMultipartPresent

Closes gh-34459

Author: sdeleuze

spring-web/src/main/java/org/springframework/http/codec/support/BaseDefaultCodecs.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -93,8 +93,6 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 
 	private static final boolean protobufPresent;
 
-	static final boolean synchronossMultipartPresent;
-
 	static final boolean nettyByteBufPresent;
 
 	static final boolean netty5BufferPresent;
@@ -112,7 +110,6 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 		jackson2SmilePresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.smile.SmileFactory", classLoader);
 		jaxb2Present = ClassUtils.isPresent("jakarta.xml.bind.Binder", classLoader);
 		protobufPresent = ClassUtils.isPresent("com.google.protobuf.Message", classLoader);
-		synchronossMultipartPresent = ClassUtils.isPresent("org.synchronoss.cloud.nio.multipart.NioMultipartParser", classLoader);
 		nettyByteBufPresent = ClassUtils.isPresent("io.netty.buffer.ByteBuf", classLoader);
 		netty5BufferPresent = ClassUtils.isPresent("io.netty5.buffer.Buffer", classLoader);
 		kotlinSerializationCborPresent = ClassUtils.isPresent("kotlinx.serialization.cbor.Cbor", classLoader);