chore(deps): bump boto3 from 1.18.0 to 1.18.1 (aws-powertools#528)

Bumps [boto3](https://github.com/boto/boto3) from 1.18.0 to 1.18.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/boto/boto3/blob/develop/CHANGELOG.rst">boto3's changelog</a>.</em></p>
<blockquote>
<h1>1.18.1</h1>
<ul>
<li>api-change:<code>appintegrations</code>: [<code>botocore</code>] Documentation update for AppIntegrations Service</li>
<li>api-change:<code>chime</code>: [<code>botocore</code>] This SDK release adds Account Status as one of the attributes in Account API response</li>
<li>api-change:<code>auditmanager</code>: [<code>botocore</code>] This release relaxes the S3 URL character restrictions in AWS Audit Manager. Regex patterns have been updated for the following attributes: s3RelativePath, destination, and s3ResourcePath. 'AWS' terms have also been replaced with entities to align with China Rebrand documentation efforts.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/boto/boto3/commit/a74ce41a937a432d0f2bddbdb8451983c18f5637"><code>a74ce41</code></a> Merge branch 'release-1.18.1'</li>
<li><a href="https://github.com/boto/boto3/commit/396de10ff62a95bedb3d9f2dfdf598ef084c27b5"><code>396de10</code></a> Bumping version to 1.18.1</li>
<li><a href="https://github.com/boto/boto3/commit/7c52212fcb93508d7481d2daaf25119f1c641cdc"><code>7c52212</code></a> Add changelog entries from botocore</li>
<li><a href="https://github.com/boto/boto3/commit/287fc1c7a08381d82bc243a21683591fe08c5202"><code>287fc1c</code></a> Merge branch 'release-1.18.0' into develop</li>
<li>See full diff in <a href="https://github.com/boto/boto3/compare/1.18.0...1.18.1">compare view</a></li>
</ul>
</details>
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