Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.5 to 2.4.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/actions/checkout/releases">actions/checkout's releases</a>.</em></p>
<blockquote>
<h2>v2.4.0</h2>
<ul>
<li>Convert SSH URLs like <code>org-&lt;ORG_ID&gt;@github.com:</code> to <code>https://github.com/</code> - <a href="https://github-redirect.dependabot.com/actions/checkout/pull/621">pr</a></li>
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</blockquote>
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<details>
<summary>Commits</summary>
<ul>
<li><a href="ec3a7ce113"><code>ec3a7ce</code></a> set insteadOf url for org-id (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/621">#621</a>)</li>
<li><a href="fd47087372"><code>fd47087</code></a> codeql should analyze lib not dist (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/620">#620</a>)</li>
<li><a href="3d677ac575"><code>3d677ac</code></a> script to generate license info (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/614">#614</a>)</li>
<li><a href="826ba42d6c"><code>826ba42</code></a> npm audit fix (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/612">#612</a>)</li>
<li><a href="eb8a193c1d"><code>eb8a193</code></a> update dev dependencies and react to new linting rules (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/611">#611</a>)</li>
<li><a href="c49af7ca1f"><code>c49af7c</code></a> Create codeql-analysis.yml (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/602">#602</a>)</li>
<li>See full diff in <a href="https://github.com/actions/checkout/compare/v2.3.5...v2.4.0">compare view</a></li>
</ul>
</details>
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</details>

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.4 to 2.3.5.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/actions/checkout/releases">actions/checkout's releases</a>.</em></p>
<blockquote>
<h2>v2.3.5</h2>
<p>Update dependencies</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="1e204e9a92"><code>1e204e9</code></a> update licensed check (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/606">#606</a>)</li>
<li><a href="0299a0d2b6"><code>0299a0d</code></a> update dist (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/605">#605</a>)</li>
<li><a href="be0f448456"><code>be0f448</code></a> Bump ws from 5.2.2 to 5.2.3 (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/604">#604</a>)</li>
<li><a href="56c00a7b1f"><code>56c00a7</code></a> Bump tmpl from 1.0.4 to 1.0.5 (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/588">#588</a>)</li>
<li><a href="85e47d1a2b"><code>85e47d1</code></a> Bump path-parse from 1.0.6 to 1.0.7 (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/568">#568</a>)</li>
<li><a href="3fc17f8645"><code>3fc17f8</code></a> Bump hosted-git-info from 2.8.5 to 2.8.9 (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/500">#500</a>)</li>
<li><a href="e3bc06d986"><code>e3bc06d</code></a> Bump lodash from 4.17.15 to 4.17.21 (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/499">#499</a>)</li>
<li><a href="442567ba57"><code>442567b</code></a> Bump handlebars from 4.5.3 to 4.7.7 (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/497">#497</a>)</li>
<li><a href="7f00b66d06"><code>7f00b66</code></a> Bump y18n from 4.0.0 to 4.0.1 (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/469">#469</a>)</li>
<li><a href="eccf386318"><code>eccf386</code></a> Bump <code>@​actions/core</code> from 1.1.3 to 1.2.6 (<a href="https://github-redirect.dependabot.com/actions/checkout/issues/361">#361</a>)</li>
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</details>

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 2.3.4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2...v2.3.4)

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# Description

- run build when on a branch matching RC[0-9]/**, in accordance with contributing.md release guide.

Closes: #5695

Replace defer with t.Cleanup().

Replace the combination of ioutil.TempDir, error checking
and defer os.RemoveAll() with Go testing.T's new TempDir()
helper.

Mark auxiliary functions as test helpers.

Co-authored-by: Erik Grinaker <erik@interchain.berlin>
Co-authored-by: Alessio Treglia <alessio@tendermint.com>