MINOR: [C#] Bump Microsoft.SourceLink.GitHub from 1.1.1 to 8.0.0 in /csharp (apache#38803)

Bumps [Microsoft.SourceLink.GitHub](https://github.com/dotnet/sourcelink) from 1.1.1 to 8.0.0.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/dotnet/sourcelink/commit/ce7339775f8ada5b16c72a874f591c8cd5722c6b"><code>ce73397</code></a> Update Readme to 8.0.0</li>
<li><a href="https://github.com/dotnet/sourcelink/commit/c782a0460234c50bc37ee1da5e4f6b93bd163aca"><code>c782a04</code></a> Update dependencies from <a href="https://github.com/dotnet/source-build-reference-pac">https://github.com/dotnet/source-build-reference-pac</a>...</li>
<li><a href="https://github.com/dotnet/sourcelink/commit/89b9cd2885d399fe1c7359eb498622711f52055e"><code>89b9cd2</code></a> Update dependencies from <a href="https://github.com/dotnet/source-build-reference-pac">https://github.com/dotnet/source-build-reference-pac</a>...</li>
<li><a href="https://github.com/dotnet/sourcelink/commit/3740aa2ab5585c5c9b65fdbe8ae44df16350263f"><code>3740aa2</code></a> Update dependencies from <a href="https://github.com/dotnet/source-build-reference-pac">https://github.com/dotnet/source-build-reference-pac</a>...</li>
<li><a href="https://github.com/dotnet/sourcelink/commit/a2b14852b21ce5408f163e7c73fccf693eceffef"><code>a2b1485</code></a> Update dependencies from <a href="https://github.com/dotnet/arcade">https://github.com/dotnet/arcade</a> build 20230901.1 (#...</li>
<li><a href="https://github.com/dotnet/sourcelink/commit/36aa65db69384672a83f1a1d381b349337ef1e17"><code>36aa65d</code></a> Update dependencies from <a href="https://github.com/dotnet/source-build-reference-pac">https://github.com/dotnet/source-build-reference-pac</a>...</li>
<li><a href="https://github.com/dotnet/sourcelink/commit/0c832ac299737ecf61dd61e413484a7ae53b2920"><code>0c832ac</code></a> Update dependencies from <a href="https://github.com/dotnet/source-build-reference-pac">https://github.com/dotnet/source-build-reference-pac</a>...</li>
<li><a href="https://github.com/dotnet/sourcelink/commit/5da1d7745d7178ae9aba532dc325ebdfb0a890a7"><code>5da1d77</code></a> Update dependencies from <a href="https://github.com/dotnet/arcade">https://github.com/dotnet/arcade</a> build 20230825.2 (#...</li>
<li><a href="https://github.com/dotnet/sourcelink/commit/1d1739c52b2d5a238727bbce10b3d15c5bf5e3cc"><code>1d1739c</code></a> Update dependencies from <a href="https://github.com/dotnet/source-build-reference-pac">https://github.com/dotnet/source-build-reference-pac</a>...</li>
<li><a href="https://github.com/dotnet/sourcelink/commit/29651f6757ba867d14165ebbe9a7e431291daf08"><code>29651f6</code></a> Update dependencies from <a href="https://github.com/dotnet/source-build-reference-pac">https://github.com/dotnet/source-build-reference-pac</a>...</li>
<li>Additional commits viewable in <a href="https://github.com/dotnet/sourcelink/compare/1.1.1...8.0.0">compare view</a></li>
</ul>
</details>
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Authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Signed-off-by: Sutou Kouhei <[email protected]>

Author: dependabot[bot]

csharp/src/Apache.Arrow/Apache.Arrow.csproj

@@ -16,7 +16,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.1.1" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>