Update dependency net-ftp to v0.3.9

This MR contains the following updates:

Package	Update	Change
net-ftp	patch	"0.3.8" -> "0.3.9"

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Release Notes

ruby/net-ftp (net-ftp)

v0.3.9

Compare Source

What's Changed

• Fix connection closing issue when using TLS by @​JonathanTron in https://github.com/ruby/net-ftp/pull/48

New Contributors

• @​JonathanTron made their first contribution in https://github.com/ruby/net-ftp/pull/48

Full Changelog: https://github.com/ruby/net-ftp/compare/v0.3.8...v0.3.9

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