Bump System.Runtime.CompilerServices.Unsafe from 5.0.0 to 6.0.0

Bumps [System.Runtime.CompilerServices.Unsafe](https://github.com/dotnet/runtime) from 5.0.0 to 6.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v5.0.0...v6.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

src/PeNet/PeNet.csproj

@@ -71,7 +71,7 @@
 
   <ItemGroup Condition=" '$(IsDotNetFramework)' == 'true' ">
     <PackageReference Include="System.Memory" Version="4.5.4" />
-    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="5.0.0" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
     <Compile Include="NET48_Helpers.cs_">
       <Link>NET48_Helpers.cs</Link>
     </Compile>