build(deps): Bump google.golang.org/grpc from 1.31.0 to 1.31.1 (#5290)

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.31.0 to 1.31.1.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/grpc/grpc-go/releases">google.golang.org/grpc's releases</a>.</em></p>
<blockquote>
<h2>Release 1.31.1</h2>
<ul>
<li>eds: fix priority timeout failure when EDS removes all priorities (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/3839">#3839</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="39ef2aaf62"><code>39ef2aa</code></a> Change version to 1.31.1</li>
<li><a href="644142cbf3"><code>644142c</code></a> eds: fix priority timeout failure when EDS removes all priorities (cherry pic...</li>
<li><a href="f3c2c5ed7e"><code>f3c2c5e</code></a> Change version to 1.31.1-dev (<a href="https://github-redirect.dependabot.com/grpc/grpc-go/issues/3756">#3756</a>)</li>
<li>See full diff in <a href="https://github.com/grpc/grpc-go/compare/v1.31.0...v1.31.1">compare view</a></li>
</ul>
</details>
<br />


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go.sum

@@ -641,6 +641,8 @@ google.golang.org/grpc v1.26.0 h1:2dTRdpdFEEhJYQD8EMLB61nnrzSCTbG38PhqdhvOltg=
 google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/grpc v1.31.0 h1:T7P4R73V3SSDPhH7WW7ATbfViLtmamH0DKrP3f9AuDI=
 google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
+google.golang.org/grpc v1.31.1 h1:SfXqXS5hkufcdZ/mHtYCh53P2b+92WQq/DZcKLgsFRs=
+google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=