Update dependency docker to v2.7.1 (#340)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [docker](https://circleci.com/developer/orbs/orb/circleci/docker) |
orb | minor | `2.6.0` -> `2.7.1` |

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.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2.1
 orbs:
   codecov: codecov/[email protected]
   gradle: circleci/[email protected]
-  docker: circleci/docker@2.6.0
+  docker: circleci/docker@2.7.1
   github-cli: circleci/[email protected]
 executors:
   jdk: