Bump @types/dockerode from 2.5.20 to 2.5.21 in /api_tests

Bumps [@types/dockerode](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/dockerode) from 2.5.20 to 2.5.21.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/dockerode)

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

Author: dependabot-preview[bot]

api_tests/package.json

@@ -22,7 +22,7 @@
         "@types/chai-as-promised": "^7.1.2",
         "@types/chai-json-schema": "^1.4.5",
         "@types/chai-subset": "^1.3.3",
-        "@types/dockerode": "^2.5.20",
+        "@types/dockerode": "^2.5.21",
         "@types/glob": "^7.1.1",
         "@types/log4js": "^2.3.5",
         "@types/mocha": "^5.2.6",

api_tests/yarn.lock

@@ -61,10 +61,10 @@
   resolved "https://registry.yarnpkg.com/@types/cookiejar/-/cookiejar-2.1.1.tgz#90b68446364baf9efd8e8349bb36bd3852b75b80"
   integrity sha512-aRnpPa7ysx3aNW60hTiCtLHlQaIFsXFCgQlpakNgDNVFzbtusSY8PwjAQgRWfSk0ekNoBjO51eQRB6upA9uuyw==
 
-"@types/dockerode@^2.5.20":
-  version "2.5.20"
-  resolved "https://registry.yarnpkg.com/@types/dockerode/-/dockerode-2.5.20.tgz#d37a3c6cd0651d9cc49e51b3769124e956d075b4"
-  integrity sha512-g2eM9q+pur7iZc897K/OSq8sCL7VdVcCPzNkdeTukUokfvgl3TaP+nT7G8BMpnSSojrJFKl7VdTciP7hbVgfKA==
+"@types/dockerode@^2.5.21":
+  version "2.5.21"
+  resolved "https://registry.yarnpkg.com/@types/dockerode/-/dockerode-2.5.21.tgz#4051b21bba6fa251ac638340ac88a3bf836c58de"
+  integrity sha512-Y9kVV7Umw0SAOsGVp06VGjlAiZbjALNhDIw69NeWNEqfI++7nQijzjWsepOkUjKHr5CrJWgK4v++6a+Ms0G/6A==
   dependencies:
     "@types/node" "*"