Bump jane-php/open-api-2 from 7.7.0 to 7.8.1 (#75)

Bumps [jane-php/open-api-2](https://github.com/janephp/open-api-2) from
7.7.0 to 7.8.1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/janephp/open-api-2/commit/cdc9efa6e98858f0273002dea07688de11e1cb4e"><code>cdc9efa</code></a>
JaneObjectNormalizer::getSupportedTypes is now produced multiline</li>
<li><a
href="https://github.com/janephp/open-api-2/commit/a9784097871029ee305362913b87dce87aaa5cc1"><code>a978409</code></a>
Fix generation of supportsNormalization</li>
<li><a
href="https://github.com/janephp/open-api-2/commit/aaa393e35899692bc6d8a504b3cd219e8a7458e9"><code>aaa393e</code></a>
Allow PHP Parser 5.x in subpackages</li>
<li><a
href="https://github.com/janephp/open-api-2/commit/31fbd19e333514dfc1a04591ff980730ea3ea9e3"><code>31fbd19</code></a>
Reenable classmap tweak</li>
<li><a
href="https://github.com/janephp/open-api-2/commit/5b0746726f43460b63aa67d328c1c9e673b27d9c"><code>5b07467</code></a>
PHP Parser 5.1 with ternary fixed</li>
<li><a
href="https://github.com/janephp/open-api-2/commit/c18d53e8a2a961b449e72446efbf7d1d9447ffb9"><code>c18d53e</code></a>
Skip a few gigantic test cases for code style fixes</li>
<li><a
href="https://github.com/janephp/open-api-2/commit/b3e7d29cb1a2b79bbfd13a9edc2e51225a202e39"><code>b3e7d29</code></a>
Fix both generated and expected</li>
<li><a
href="https://github.com/janephp/open-api-2/commit/d3a77e8819bb82949c513b01b9ae236bf3b06d18"><code>d3a77e8</code></a>
CS Fixer</li>
<li><a
href="https://github.com/janephp/open-api-2/commit/29cef0cbe72418e957a278345af0b598b4fbf184"><code>29cef0c</code></a>
WIP</li>
<li><a
href="https://github.com/janephp/open-api-2/commit/e0ef66827e252fe065e159f10f137eee21873d9e"><code>e0ef668</code></a>
Update tests</li>
<li>Additional commits viewable in <a
href="https://github.com/janephp/open-api-2/compare/v7.7.0...v7.8.1">compare
view</a></li>
</ul>
</details>
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