[ISSUE #3815]Fix chinese string are truncated in ConcunrrentDiskUtil

[ljhrot]

#3815

What is the purpose of the change

Fix chinese string are truncated in ConcunrrentDiskUtil.

Brief changelog

Fix chinese string are truncated in ConcunrrentDiskUtil.

Verifying this change

look at unit test

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[zyling10]

com.alibaba.nacos.client.config.utils.ConcurrentDiskUtil#writeFileContent，此方法也有同样的问题 @KomachiSion
ByteBuffer sendBuffer = ByteBuffer.wrap(content.getBytes(charsetName)); while (sendBuffer.hasRemaining()) { channel.write(sendBuffer); } channel.truncate(content.length());