Bump Platform.Threading from 0.2.1 to 0.3.0

Bumps [Platform.Threading](https://github.com/linksplatform/Threading) from 0.2.1 to 0.3.0.
- [Release notes](https://github.com/linksplatform/Threading/releases)
- [Commits](linksplatform/Threading@0.2.1...0.3.0)

---
updated-dependencies:
- dependency-name: Platform.Threading
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

csharp/Platform.IO/Platform.IO.csproj

@@ -37,7 +37,7 @@ Truncate, AppendLine, EachLine methods are added to the FileHelpers class.</Pack
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Platform.Threading" Version="0.2.1" />
+    <PackageReference Include="Platform.Threading" Version="0.3.0" />
     <PackageReference Include="Platform.Unsafe" Version="0.4.1" />
   </ItemGroup>