fix(deps): update module github.com/pkg/sftp to v1.13.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/pkg/sftp	v1.13.8 -> v1.13.9

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Release Notes

pkg/sftp (github.com/pkg/sftp)

v1.13.9: - better Remove errors, short-circuit unsupported fsync, and ReadFull for readfrom

Compare Source

What's Changed

• Backport v2/Client.Remove and File.Sync by @​puellanivis in https://github.com/pkg/sftp/pull/618
• perf: ensure full write buffer for *File.ReadFrom by @​justfalter in https://github.com/pkg/sftp/pull/623

New Contributors

• @​justfalter made their first contribution in https://github.com/pkg/sftp/pull/623

Full Changelog: pkg/sftp@v1.13.8...v1.13.9

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