Bump System.Runtime.CompilerServices.Unsafe from 6.0.0 to 6.1.0 (#1101)

Bumps [System.Runtime.CompilerServices.Unsafe](https://github.com/dotnet/maintenance-packages) from 6.0.0 to 6.1.0.
- [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-type: direct:production
  update-type: version-update:semver-minor
...

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

MimeKit/MimeKit.csproj

@@ -80,7 +80,7 @@
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net4')) Or $(TargetFramework.StartsWith('netstandard2.')) ">
     <PackageReference Include="System.Buffers" Version="4.6.0" />
     <PackageReference Include="System.Memory" Version="4.5.5" />
-    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.1.0" />
   </ItemGroup>
 
   <ItemGroup>

MimeKit/MimeKitLite.csproj

@@ -62,7 +62,7 @@
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net4')) Or $(TargetFramework.StartsWith('netstandard2.')) ">
-    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.1.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net4')) Or $(TargetFramework.StartsWith('netstandard2.')) ">