Bump System.Memory from 4.5.2 to 4.5.3 (#275)

Bumps [System.Memory](https://github.com/dotnet/corefx) from 4.5.2 to 4.5.3.
- [Release notes](https://github.com/dotnet/corefx/releases)
- [Commits](https://github.com/dotnet/corefx/commits)

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

Author: dependabot-preview[bot]

Fritz.StreamTools/Fritz.StreamTools.csproj

@@ -28,7 +28,7 @@
 		<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.1.6" />
 		<PackageReference Include="Octokit" Version="0.32.0" />
 		<PackageReference Include="System.IO.Abstractions" Version="4.2.4" />
-		<PackageReference Include="System.Memory" Version="4.5.2" />
+		<PackageReference Include="System.Memory" Version="4.5.3" />
 	</ItemGroup>
 	<ItemGroup>
 		<None Include="wwwroot\js\GoalConfiguration\GoalConfiguration.js" />