archive/zip: append slash to directory names

[yincongcyincong]

Fixes #71235

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Patch Set 1:

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Patch Set 1:

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Patch Set 1:

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This PR (HEAD: d68d049) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/go/+/642375.

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Patch Set 2:

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