.Net: Bump SharpToken from 1.2.14 to 1.2.15 in /dotnet (#4980)

Bumps [SharpToken](https://github.com/dmitry-brazhenko/SharpToken) from
1.2.14 to 1.2.15.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dmitry-brazhenko/SharpToken/releases">SharpToken's
releases</a>.</em></p>
<blockquote>
<h2>Release 1.2.15</h2>
<p>Release of version 1.2.15</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/dmitry-brazhenko/SharpToken/commit/e47dc0e43eb3496089d20a5da3d93b37a40b6d0d"><code>e47dc0e</code></a>
new mapping (<a
href="https://github.com/dmitry-brazhenko/SharpToken/issues/28">#28</a>)</li>
<li>See full diff in <a
href="https://github.com/dmitry-brazhenko/SharpToken/compare/1.2.14...1.2.15">compare
view</a></li>
</ul>
</details>
<br />


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</details>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

dotnet/Directory.Packages.props

@@ -31,7 +31,7 @@
     <!-- Tokenizers -->
     <PackageVersion Include="Microsoft.ML.Tokenizers" Version="0.21.0" />
     <PackageVersion Include="Microsoft.DeepDev.TokenizerLib" Version="1.3.3" />
-    <PackageVersion Include="SharpToken" Version="1.2.14" />
+    <PackageVersion Include="SharpToken" Version="1.2.15" />
     <!-- Microsoft.Extensions.* -->
     <PackageVersion Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Configuration.Binder" Version="8.0.0" />