Bump extern/openPMD-api from 94a3a8f to 269c5e2 (#803)

Bumps [extern/openPMD-api](https://github.com/openPMD/openPMD-api) from
`94a3a8f` to `269c5e2`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/openPMD/openPMD-api/commit/269c5e22de1bdcb6296896c060eb6b8777af7ae9"><code>269c5e2</code></a>
Remove mpirun_workaround.sh (<a
href="https://redirect.github.com/openPMD/openPMD-api/issues/1698">#1698</a>)</li>
<li><a
href="https://github.com/openPMD/openPMD-api/commit/d1015eefb766aee129283851fdabfb7e8935e698"><code>d1015ee</code></a>
Non-spatial meshes (<a
href="https://redirect.github.com/openPMD/openPMD-api/issues/1534">#1534</a>)</li>
<li><a
href="https://github.com/openPMD/openPMD-api/commit/4a040bbc225747711fe9d2d7854d4222bac17ff3"><code>4a040bb</code></a>
Explicitly specify ADIOS2 components in openPMDConfig.cmake (<a
href="https://redirect.github.com/openPMD/openPMD-api/issues/1693">#1693</a>)</li>
<li><a
href="https://github.com/openPMD/openPMD-api/commit/67c95fcfafc797465a2f57c07265a9827b01bf04"><code>67c95fc</code></a>
Take TOML out of Python testing (<a
href="https://redirect.github.com/openPMD/openPMD-api/issues/1694">#1694</a>)</li>
<li>See full diff in <a
href="https://github.com/openPMD/openPMD-api/compare/94a3a8f77710980aab36b53afc0648e047b15a1c...269c5e22de1bdcb6296896c060eb6b8777af7ae9">compare
view</a></li>
</ul>
</details>
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