chore(deps): Bump grpc from 1.24.6 to 1.24.9 (#494)

Bumps [grpc](https://github.com/grpc/grpc-node) from 1.24.6 to 1.24.9.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/grpc/grpc-node/releases">grpc's releases</a>.</em></p>
<blockquote>
<h2>Node gRPC v1.24.7</h2>
<ul>
<li>Log just serialization and deserialization errors on the server, instead of logging all errors with the code <code>INTERNAL</code> (<a href="https://github-redirect.dependabot.com/grpc/grpc-node/issues/1750">#1750</a>)</li>
<li>Replace the <code>instanceof Function</code> check to make it work properly in certain environments (<a href="https://github-redirect.dependabot.com/grpc/grpc-node/issues/1759">#1759</a> contributed by <a href="https://github.com/zereraz"><code>@​zereraz</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/grpc/grpc-node/commits">compare view</a></li>
</ul>
</details>
<br />


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package.json

@@ -81,7 +81,7 @@
     "env-var": "^7.0.0",
     "fastify": "^3.15.1",
     "fastify-mongoose": "^0.3.0",
-    "grpc": "^1.24.6",
+    "grpc": "^1.24.9",
     "grpc-health-check": "^1.8.0",
     "it-pipe": "^1.1.0",
     "mongoose": "^5.10.18",