Update dependency docker to v2.8.1 (#132)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [docker](https://circleci.com/developer/orbs/orb/circleci/docker) |
orb | patch | `2.8.0` -> `2.8.1` |

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.circleci/config.yml

@@ -1,7 +1,7 @@
 version: '2.1'
 orbs:
   node: circleci/node@6.3.0
-  docker: circleci/docker@2.8.0
+  docker: circleci/docker@2.8.1
   codecov: codecov/codecov@4.2.0
   github-cli: circleci/github-cli@2.5.0
 executors: