Bump docker-api from 2.3.0 to 2.4.0 in the ruby-dependencies group

Bumps the ruby-dependencies group with 1 update: [docker-api](https://github.com/swipely/docker-api).


Updates `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
  dependency-group: ruby-dependencies
...

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

Gemfile.lock

@@ -3,11 +3,11 @@ GEM
   specs:
     base64 (0.2.0)
     diff-lcs (1.5.1)
-    docker-api (2.3.0)
+    docker-api (2.4.0)
       excon (>= 0.64.0)
       multi_json
     erubis (2.7.0)
-    excon (0.111.0)
+    excon (0.112.0)
     heroics (0.1.3)
       base64
       erubis (~> 2.0)