Bump to net-ssh 7.x

[beechtom]

Use Case

net-ssh recently started releasing the 7.x series. We should bump this gem to keep up-to-date with any security fixes and new features that are released in the future.

Notes

• Requires Ruby >= 2.6. This prevents us from bumping until all other packages that use Bolt no longer support Ruby 2.5.
• Removes support for several algorithms that are no longer considered secure. This affects Bolt's ssh.*-algorithms config and introduces breaking changes.
• We need to investigate what other breaking changes were made so we can update Bolt accordingly.

[github-actions]

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[silug]

This issue has not had activity for 60 days and will be marked as stale. If this issue continues to have no activity for 7 days, it will be closed.

This is still a valid issue.

[github-actions]

This issue has not had activity for 60 days and will be marked as stale.
If this issue continues to have no activity for 7 days, it will be closed.

[silug]

This issue has not had activity for 60 days and will be marked as stale. If this issue continues to have no activity for 7 days, it will be closed.

Bolt 3.26.1 still includes net-ssh 6.1.0.

[github-actions]

This issue has not had activity for 60 days and will be marked as stale.
If this issue continues to have no activity for 7 days, it will be closed.

[bastelfreak]

I think this github bot is really not helpful.