[Snyk] Security upgrade express from 4.17.1 to 4.21.1#256

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fengyun2 wants to merge 1 commit intomasterfrom snyk-fix-c730352b5d4c308d1b18b47fcfce3a98

Commits on Oct 15, 2024

fix: packages/umi-serve/package.json & packages/umi-serve/yarn.lock to reduce vulnerabilities
snyk-bot
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