Bump boto3 from 1.18.49 to 1.18.51 (#47)

Bumps [boto3](https://github.com/boto/boto3) from 1.18.49 to 1.18.51.
<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>1.18.51</h1>
<ul>
<li>api-change:<code>lambda</code>: [<code>botocore</code>] Adds support for Lambda functions powered by AWS Graviton2 processors. Customers can now select the CPU architecture for their functions.</li>
<li>api-change:<code>sesv2</code>: [<code>botocore</code>] This release includes the ability to use 2048 bits RSA key pairs for DKIM in SES, either with Easy DKIM or Bring Your Own DKIM.</li>
<li>api-change:<code>amp</code>: [<code>botocore</code>] This release adds alert manager and rule group namespace APIs</li>
</ul>
<h1>1.18.50</h1>
<ul>
<li>api-change:<code>transfer</code>: [<code>botocore</code>] Added changes for managed workflows feature APIs.</li>
<li>api-change:<code>imagebuilder</code>: [<code>botocore</code>] Fix description for AmiDistributionConfiguration Name property, which actually refers to the output AMI name. Also updated for consistent terminology to use &quot;base&quot; image, and another update to fix description text.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/boto/boto3/commit/dee188acbff6f802cb664b38e2f30121845dbf19"><code>dee188a</code></a> Merge branch 'release-1.18.51'</li>
<li><a href="https://github.com/boto/boto3/commit/f8c782ac2224cac2cf97e410adf81a832fc233b2"><code>f8c782a</code></a> Bumping version to 1.18.51</li>
<li><a href="https://github.com/boto/boto3/commit/da2cc18c1218fa751cef5530fa269658453538f0"><code>da2cc18</code></a> Add changelog entries from botocore</li>
<li><a href="https://github.com/boto/boto3/commit/3518cfb2ec8d3cf5e9dae31bb7d551368408786d"><code>3518cfb</code></a> Merge branch 'release-1.18.50'</li>
<li><a href="https://github.com/boto/boto3/commit/3d202fc5a39432fc66bb3a2fad67b9ee69c8f6cb"><code>3d202fc</code></a> Merge branch 'release-1.18.50' into develop</li>
<li><a href="https://github.com/boto/boto3/commit/ac5e53cc9b6d8a33567f09b63ed08d4f6de226df"><code>ac5e53c</code></a> Bumping version to 1.18.50</li>
<li><a href="https://github.com/boto/boto3/commit/dc280fdd272fd90e916fcd6992e29133eb7690f6"><code>dc280fd</code></a> Add changelog entries from botocore</li>
<li><a href="https://github.com/boto/boto3/commit/f009e3b2106a1a398f0d8332850b8531fbabaf5d"><code>f009e3b</code></a> Merge branch 'release-1.18.49' into develop</li>
<li>See full diff in <a href="https://github.com/boto/boto3/compare/1.18.49...1.18.51">compare view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=boto3&package-manager=pip&previous-version=1.18.49&new-version=1.18.51)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)


</details>