Bump droplet_kit from 3.13.0 to 3.13.1 (#993)

Bumps [droplet_kit](https://github.com/digitalocean/droplet_kit) from 3.13.0 to 3.13.1.
- [Release notes](https://github.com/digitalocean/droplet_kit/releases)
- [Changelog](https://github.com/digitalocean/droplet_kit/blob/main/CHANGELOG.md)
- [Commits](digitalocean/droplet_kit@v3.13.0...v3.13.1)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -90,7 +90,7 @@ GEM
       responders
       warden (~> 1.2.3)
     diff-lcs (1.4.4)
-    droplet_kit (3.13.0)
+    droplet_kit (3.13.1)
       faraday (>= 0.15)
       kartograph (~> 0.2.3)
       resource_kit (~> 0.1.5)