Bump System.Runtime.CompilerServices.Unsafe from 6.0.0 to 6.1.2 (#222)

Bumps [System.Runtime.CompilerServices.Unsafe](https://github.com/dotnet/maintenance-packages) from 6.0.0 to 6.1.2.
- [Release notes](https://github.com/dotnet/maintenance-packages/releases)
- [Commits](https://github.com/dotnet/maintenance-packages/commits)

---
updated-dependencies:
- dependency-name: System.Runtime.CompilerServices.Unsafe
  dependency-version: 6.1.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

PacketDotNet/PacketDotNet.csproj

@@ -37,7 +37,7 @@
   </ItemGroup>  
 
   <ItemGroup>
-    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.1.2" />
   </ItemGroup>
 
 </Project>