Bump MU_BASECORE from 2023020006.2.3 to 2023020006.3.1 (#719)

Bumps MU_BASECORE from `2023020006.2.3` to `2023020006.3.1`


Introduces 6 new commits in
[MU_BASECORE](https://github.com/microsoft/mu_basecore.git).

<details>
<summary>Commits</summary>
<ul>
<li><a
href="6e5a984096">6e5a98</a>
Repo File Sync: synced file(s) with microsoft/mu_devops (<a
href="https://github.com/microsoft/mu_basecore/pull/576">#576</a>)</li>
<li><a
href="76416ab56c">76416a</a>
pip: update edk2-pytool-library requirement from ~=0.18.0 to ~=0.18.1
(<a
href="https://github.com/microsoft/mu_basecore/pull/577">#577</a>)</li>
<li><a
href="c3baf893e5">c3baf8</a>
.pytool/Plugin: Improve Rust support (<a
href="https://github.com/microsoft/mu_basecore/pull/578">#578</a>)</li>
<li><a
href="759eb15b4e">759eb1</a>
Create Google mock for ReadOnlyVariable2 (<a
href="https://github.com/microsoft/mu_basecore/pull/579">#579</a>)</li>
<li><a
href="77111325f4">771113</a>
.pytool/Plugin: Better Rust Support (<a
href="https://github.com/microsoft/mu_basecore/pull/580">#580</a>)</li>
<li><a

href="c8101ebb0a">c8101eb</a>
RustHostUnitTestPlugin: Skip plugin when package has no rust crates (<a
href="https://github.com/microsoft/mu_basecore/pull/583">#583</a>)</li>
</ul>
</details>

Signed-off-by: Project Mu Bot <mubot@microsoft.com>

---------

Signed-off-by: Project Mu Bot <mubot@microsoft.com>
Co-authored-by: Joey Vagedes <joeyvagedes@microsoft.com>