chore(deps): bump boto3 from 1.18.25 to 1.18.26 (#627)

Bumps [boto3](https://github.com/boto/boto3) from 1.18.25 to 1.18.26.
<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>1.18.26</h1>
<ul>
<li>api-change:<code>eks</code>: [<code>botocore</code>] Adds support for EKS add-ons &quot;preserve&quot; flag, which allows customers to maintain software on their EKS clusters after removing it from EKS add-ons management.</li>
<li>api-change:<code>comprehend</code>: [<code>botocore</code>] Add tagging support for Comprehend async inference job.</li>
<li>api-change:<code>robomaker</code>: [<code>botocore</code>] Documentation updates for RoboMaker</li>
<li>api-change:<code>ec2</code>: [<code>botocore</code>] encryptionInTransitSupported added to DescribeInstanceTypes API</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/boto/boto3/commit/c2b0842ecb87f78ac4f12403264c40abe4c57788"><code>c2b0842</code></a> Merge branch 'release-1.18.26'</li>
<li><a href="https://github.com/boto/boto3/commit/33668c22b79165a63fb062ac06ea13781dd818ca"><code>33668c2</code></a> Bumping version to 1.18.26</li>
<li><a href="https://github.com/boto/boto3/commit/c55af671128d18389ab61807da25a12f3c4578d8"><code>c55af67</code></a> Add changelog entries from botocore</li>
<li><a href="https://github.com/boto/boto3/commit/99eaf0eb4cfbb914f8876dfef466045ad4234668"><code>99eaf0e</code></a> Merge branch 'release-1.18.25' into develop</li>
<li>See full diff in <a href="https://github.com/boto/boto3/compare/1.18.25...1.18.26">compare view</a></li>
</ul>
</details>
<br />


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</details>

pyproject.toml

@@ -23,7 +23,7 @@ license = "MIT-0"
 python = "^3.6.1"
 aws-xray-sdk = "^2.8.0"
 fastjsonschema = "^2.14.5"
-boto3 = "^1.12"
+boto3 = "^1.18"
 jmespath = "^0.10.0"
 pydantic = {version = "^1.8.2", optional = true }
 email-validator = {version = "*", optional = true }