建议修改go.mod文件里面的go语言的版本，并在readme中注明，该项目需要go 1.21才可以运行

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Describe the bug
建议修改go.mod文件里面的go语言的版本，并在readme中注明，该项目需要go 1.21才可以运行
log/slog包是1.21才引入的。
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