massdriver 1.13.6

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Created by brew bump

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Created with brew bump-formula-pr.

Details

release notes

## What's Changed
* update artifact pull/create to use payload by @chrisghill in https://github.com/massdriver-cloud/mass/pull/204
* handle cost field nil by @coryodaniel in https://github.com/massdriver-cloud/mass/pull/205
Full Changelog: massdriver-cloud/mass@1.13.5...1.13.6

View the full release notes at https://github.com/massdriver-cloud/mass/releases/tag/1.13.6.

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