.Net: Bump YamlDotNet from 15.1.2 to 15.1.4 in /dotnet (#6232)

Bumps [YamlDotNet](https://github.com/aaubry/YamlDotNet) from 15.1.2 to
15.1.4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/aaubry/YamlDotNet/releases">YamlDotNet's
releases</a>.</em></p>
<blockquote>
<h2>Release 15.1.4</h2>
<ul>
<li>
<p>Merge pull request <a
href="https://redirect.github.com/aaubry/YamlDotNet/issues/903">#903</a>
from lahma/license-expression<br />
Switch to using PackageLicenseExpression</p>
</li>
<li>
<p>Merge pull request <a
href="https://redirect.github.com/aaubry/YamlDotNet/issues/904">#904</a>
from airbreather/fix-656<br />
Add a regression test for <a
href="https://redirect.github.com/aaubry/YamlDotNet/issues/656">#656</a></p>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/aaubry/YamlDotNet/commit/22070fd40d0fbfb148d3bf100bcb4a5583597506"><code>22070fd</code></a>
Merge pull request <a
href="https://redirect.github.com/aaubry/YamlDotNet/issues/904">#904</a>
from airbreather/fix-656</li>
<li><a
href="https://github.com/aaubry/YamlDotNet/commit/4da74f4cd51a88f36cea3fb8a3c868df19e8ce5e"><code>4da74f4</code></a>
Merge pull request <a
href="https://redirect.github.com/aaubry/YamlDotNet/issues/903">#903</a>
from lahma/license-expression</li>
<li><a
href="https://github.com/aaubry/YamlDotNet/commit/c9b7638ec35eb3881cff56f9ee46aeb74a410fd6"><code>c9b7638</code></a>
Switch to using PackageLicenseExpression</li>
<li><a
href="https://github.com/aaubry/YamlDotNet/commit/912e5f9ca0f6cda263d191a33db78df7e4fd68ec"><code>912e5f9</code></a>
Ensure that this new test can't just pass by leaving the object in its
defaul...</li>
<li><a
href="https://github.com/aaubry/YamlDotNet/commit/83beaba8c8c17344acbcc417f9aa88d8707b45ee"><code>83beaba</code></a>
It was actually fixed in e1986a45</li>
<li>See full diff in <a
href="https://github.com/aaubry/YamlDotNet/compare/v15.1.2...v15.1.4">compare
view</a></li>
</ul>
</details>
<br />


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dotnet/Directory.Packages.props

@@ -83,7 +83,7 @@
     <PackageVersion Include="Grpc.Net.Client" Version="2.62.0" />
     <PackageVersion Include="protobuf-net" Version="3.2.30" />
     <PackageVersion Include="protobuf-net.Reflection" Version="3.2.12" />
-    <PackageVersion Include="YamlDotNet" Version="15.1.2" />
+    <PackageVersion Include="YamlDotNet" Version="15.1.4" />
     <PackageVersion Include="Fluid.Core" Version="2.10.0" />
     <!-- Memory stores -->
     <PackageVersion Include="Microsoft.Azure.Cosmos" Version="3.41.0-preview.0" />