fix(upload): add "null" to the TypeScript type of "capture"

[nys013]

文档描述为

但设置:capture="null" ts会飘红报错

建议修改capture的ts类型，增加null

capture: someType<boolean | 'user' | 'environment' | null>([Boolean, String]),
capture: [Boolean, String] as PropType<boolean | 'user' | 'environment' | null>,

或者改文档描述为

You can set `:capture="undefined"`
你可以设置 `:capture="undefined"`

看代码{...(capture != null ? { capture } : {})}是用!=比较的，所以传undefined也可以

且这一描述一开始应该是针对这个issue5986加的吧

[github-actions]

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