Update net-ssh requirement from >= 2.9, < 7.0 to >= 2.9, < 8.0

[dependabot]

Updates the requirements on net-ssh to permit the latest version.

Changelog

Sourced from net-ssh's changelog.

=== 6.1.0

• Adapt to ssh's default behaviors when no username is provided. When Net::SSH.start user is nil and config has no entry we default to Etc.getpwuid.name() instead of Etc.getlogin(). #749

=== 6.1.0.rc1

• Make sha2-{256,512}-etm@openssh.com MAC default again #761
• Support algorithm subtraction syntax from ssh_config #751

=== 6.0.2

• Fix corrupted hmac issue in etm hmac #759

=== 6.0.1

• Make sha2-{256,512}-etm@openssh.com MAC opt-in as they seems to have issues #757

=== 6.0.0

• Support empty lines and comments in known_hosts [donoghuc, #742]
• Add sha2-{256,512}-etm@openssh.com MAC algorithms [graaff, #714]

=== 6.0.0 beta2

• Support :certkeys and CertificateFile configuration option [Anders Carling, #722]

=== 6.0.0 beta1

• curve25519sha256 support [Florian Wininger ,#690]
• disabled insecure algs [Florian Wininger , #709]

=== 5.2.0

=== 5.2.0.rc3

• Fix check_host_ip read from config
• Support ssh-ed25519 in known hosts

=== 5.2.0.rc2

• Read check_host_ip from ssh config files

=== 5.2.0.rc1

• Interpret * and ? in know_hosts file [Romain Tartière, #660]
• New :check_host_ip so ip checking can be disabled in known hosts [Romain Tartière, #656]

=== 5.1.0

... (truncated)

Commits

• 74919ef 6.1 release prepare
• 3768f1f Merge pull request #762 from noda50/master
• 07a4c1d Let use Etc.getpwuid.name() instead of Etc.getlogin to adapt default behavior...
• 139126b 6.1.0.rc1
• 9266909 Merge pull request #761 from net-ssh/revert-757-opt-in-etm-hmac
• ccb874c Revert "Make hmac-sha2-{256,512}-etm opt-in"
• a6db052 Merge pull request #756 from keithrbennett/clarify-readme
• 996b6c8 Merge pull request #760 from net-ssh/fwininger-patch-1
• 39d70af Merge pull request #759 from mfazekas/fix-corrup-hmac-issue
• 0294c53 Update README.md
• Additional commits viewable in compare view

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