fix(deps): update module github.com/pkg/sftp to v1.13.6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/pkg/sftp	require	patch	v1.13.5 -> v1.13.6

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Release Notes

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

v1.13.6

Compare Source

[GH-499] writeToSequential: improve tests for write errors
[GH-513] More context for EOF during client setup
[GH-516] RealPathFileLister: allow to return an error
[GH-525] Document the weirdness of the reversal of arguments to SSH_FXP_SYMLINK
[GH-526] request server: handle relative symlinks
[GH-528] Add support for working directory in Server
[GH-533] CI: add CIFuzz integration
[GH-537] Stop ReadFromWithConcurrency sending more data than it needs to
[GH-545] refactor sshfx encoding, fix link rot, go fmt
[GH-553] Marshal extended attribute data if FileInfo supports it
[GH-554] Properly handle io.EOF error conditions when reading

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[rhatdan]

/approve
/lgtm

[openshift-ci]

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