Bump docker-api from 2.3.0 to 2.4.0

Bumps [docker-api](https://github.com/swipely/docker-api) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/swipely/docker-api/releases)
- [Commits](upserve/docker-api@v2.3.0...v2.4.0)

---
updated-dependencies:
- dependency-name: docker-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -142,15 +142,15 @@ GEM
     debug_inspector (1.2.0)
     diff-lcs (1.5.1)
     docile (1.4.1)
-    docker-api (2.3.0)
+    docker-api (2.4.0)
       excon (>= 0.64.0)
       multi_json
     drb (2.2.1)
     erubi (1.13.0)
     et-orbi (1.2.11)
       tzinfo
     eventmachine (1.2.7)
-    excon (1.0.0)
+    excon (1.1.1)
     execjs (2.10.0)
     factory_bot (6.5.0)
       activesupport (>= 5.0.0)