chore(deps-dev): Bump @relaycorp/ws-mock from 2.0.2 to 2.0.3 (#159)

Bumps [@relaycorp/ws-mock](https://github.com/relaycorp/ws-mock-js) from 2.0.2 to 2.0.3.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/relaycorp/ws-mock-js/releases"><code>@​relaycorp/ws-mock</code>'s releases</a>.</em></p>
<blockquote>
<h2>v2.0.3</h2>
<h2><a href="https://github.com/relaycorp/ws-mock-js/compare/v2.0.2...v2.0.3">2.0.3</a> (2021-06-28)</h2>
<h3>Bug Fixes</h3>
<ul>
<li><strong>stream:</strong> Start capturing incoming messages before stream is read (<a href="https://github-redirect.dependabot.com/relaycorp/ws-mock-js/issues/76">#76</a>) (<a href="https://github.com/relaycorp/ws-mock-js/commit/3166702461fd6ed2a01ce5ae4a92c9c2dc4bd82c">3166702</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/relaycorp/ws-mock-js/commit/3166702461fd6ed2a01ce5ae4a92c9c2dc4bd82c"><code>3166702</code></a> fix(stream): Start capturing incoming messages before stream is read (<a href="https://github-redirect.dependabot.com/relaycorp/ws-mock-js/issues/76">#76</a>)</li>
<li><a href="https://github.com/relaycorp/ws-mock-js/commit/e50947681335df8a5771f2b4fd8864852e73b4a0"><code>e509476</code></a> chore: Bump prettier from 2.3.1 to 2.3.2 (<a href="https://github-redirect.dependabot.com/relaycorp/ws-mock-js/issues/73">#73</a>)</li>
<li>See full diff in <a href="https://github.com/relaycorp/ws-mock-js/compare/v2.0.2...v2.0.3">compare view</a></li>
</ul>
</details>
<br />


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package.json

@@ -51,7 +51,7 @@
   "devDependencies": {
     "@relaycorp/relaynet-testing": "^1.2.1",
     "@relaycorp/shared-config": "^1.5.0",
-    "@relaycorp/ws-mock": "^2.0.2",
+    "@relaycorp/ws-mock": "^2.0.3",
     "@types/jest": "^26.0.23",
     "@types/verror": "^1.10.4",
     "@types/ws": "^7.4.1",