Update spring-boot-starter.md,arthas-all-3.7.2版本后已经支持springboot3了

[qiuqiuqiu123]

arthas-all-3.7.2版本后已经支持springboot3了,避免用户升级springboot3后，对此产生误解

[CLAassistant]

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1 out of 2 committers have signed the CLA.

:white_check_mark: qiuqiuqiu123
:x: hengyunabc
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