Bump middleman from 4.4.3 to 4.5.0

[dependabot[bot]]

Bumps middleman from 4.4.3 to 4.5.0.

Changelog

Sourced from middleman's changelog.

4.5.0

• Support Haml 6 (#2590)
• Add support for Ruby 3.1 (#2635)
• Switch from Webrick to Addressable for uri encode/decode (#2622)
• Fix 18n fallback when "mount_at_root" is false (4.x) (#2605)
• external pipeline: add option to ignore process exit code (#2623)
• Backport of i18n lookup table changes to 4.x (#2604)

Commits

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