replace replace with take according to clippy suggestion

[lovelock]

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[krahets]

Hi @rongyi , could you review this PR? Thx!

[rongyi]

std::mem::take is essentially a specialized version of replace that always uses the default value (Default::default()) as the replacement. It's equivalent to:

std::mem::replace(&mut self.buckets, Vec::new())

so, yes, this change LGTM

[rongyi]

LGTM

[krahets]

Thank you for the PR!