Bump kamal from 1.7.3 to 1.8.0

[dependabot[bot]]

⚠️ Dependabot is rebasing this PR ⚠️

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Bumps kamal from 1.7.3 to 1.8.0.

Release notes

Sourced from kamal's releases.

v1.8.0

What's Changed

• Remove the deprecated docker compose version by @​nickhammond in basecamp/kamal#869
• Add ENV['KAMAL_SERVICE'] to hooks by @​nickhammond in basecamp/kamal#868
• Seed docker mirrors by pulling once per mirror first by @​djmb in basecamp/kamal#879
• Configurable SSH Identity by @​acidtib in basecamp/kamal#866
• Bump sshkit to support unbracketed IPv6 addresses by @​jeromedalbert in basecamp/kamal#862
• Remove Ruby 2.7 from CI by @​djmb in basecamp/kamal#847
• Ensure envify templates aren't polluted by existing env by @​jeremy in basecamp/kamal#865
• feat: Use git email as performer when available by @​pagbrl in basecamp/kamal#878
• Revert "Add x25519 gem, support Curve25519" by @​djmb in basecamp/kamal#883

New Contributors

• @​jeromedalbert made their first contribution in basecamp/kamal#862

Full Changelog: https://github.com/basecamp/kamal/compare/v1.7.3...v1.8.0

Commits

• fa73d72 Bump version for 1.8.0
• c535e4e Merge pull request #883 from basecamp/revert-840-main
• 0ea07b1 Merge pull request #878 from pagbrl/main
• 03b531f Merge pull request #865 from basecamp/clean-envify-env
• d8570d1 Merge pull request #847 from basecamp/remove-ruby-2.7-from-ci
• 3fe70b4 Merge pull request #862 from jeromedalbert/bump-sshkit
• ade8b43 Merge pull request #866 from acidtib/ssh-key-overwrite
• d24fc3c Revert "Add x25519 gem, support Curve25519"
• 7c244bb Merge pull request #879 from basecamp/seed-mirror
• 1369c46 Seed docker mirrors by pulling once per mirror first
• Additional commits viewable in compare view

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