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Fix: Add UTF-8 charset to Content-Type header for Chinese tool names by internet-dot · Pull Request #905 · modelcontextprotocol/java-sdk

@internet-dot 

When calling tools with Chinese names using HttpClientSseClientTransport
or HttpClientStreamableHttpTransport, the JSON body was sent without
explicit charset encoding. This caused Chinese characters to be corrupted
on the server side because the default encoding wasn't UTF-8.

This fix adds '; charset=UTF-8' to the Content-Type header in both transport
classes, ensuring proper encoding of non-ASCII characters.

Fixes modelcontextprotocol#260