Bump Common/MU_TIANO from `668d470` to `50fd5d8` (#540)

Bumps [Common/MU_TIANO](https://github.com/microsoft/mu_tiano_plus) from
`668d470` to `50fd5d8`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="50fd5d8f3a"><code>50fd5d8</code></a>
pip: bump regex from 2023.3.23 to 2023.5.5 (<a
href="https://redirect.github.com/microsoft/mu_tiano_plus/issues/130">#130</a>)</li>
<li><a
href="a08dace048"><code>a08dace</code></a>
Repo File Sync: Update CodeQL workflow trigger (<a
href="https://redirect.github.com/microsoft/mu_tiano_plus/issues/129">#129</a>)</li>
<li>See full diff in <a
href="668d470969...50fd5d8f3a">compare
view</a></li>
</ul>
</details>
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