Bump System.IO.Pipelines from 4.7.2 to 4.7.3 (#394)

Bumps [System.IO.Pipelines](https://github.com/dotnet/corefx) from 4.7.2 to 4.7.3.
- [Release notes](https://github.com/dotnet/corefx/releases)
- [Commits](https://github.com/dotnet/corefx/commits)

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

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

Author: dependabot[bot]

Directory.Build.targets

@@ -36,7 +36,7 @@
     <PackageReference Update="Bogus" Version="31.0.3" />
     <PackageReference Update="Snapper" Version="2.2.4" />
     <PackageReference Update="Xunit.SkippableFact" Version="1.4.13" />
-    <PackageReference Update="System.IO.Pipelines" Version="4.7.2" />
+    <PackageReference Update="System.IO.Pipelines" Version="4.7.3" />
     <PackageReference Update="Nerdbank.Streams" Version="2.6.81" />
     <PackageReference Update="CodeGeneration.Roslyn.Attributes" Version="0.7.63" PrivateAssets="all" />
     <PackageReference Update="CodeGeneration.Roslyn.Engine" Version="0.7.63" />

benchmarks/Pipeline/Pipeline.csproj

@@ -8,7 +8,7 @@
 
     <ItemGroup>
         <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
-        <PackageReference Include="System.IO.Pipelines" Version="4.7.2" />
+        <PackageReference Include="System.IO.Pipelines" Version="4.7.3" />
         <PackageReference Include="BenchmarkDotNet" Version="0.12.1" />
         <PackageReference Include="Nerdbank.Streams" Version="2.6.81" />
     </ItemGroup>

sample/SampleServer/SampleServer.csproj

@@ -20,7 +20,7 @@
         <PackageReference Include="System.Text.Encoding" Version="4.3.0" />
         <PackageReference Include="System.Text.Encoding.Extensions" Version="4.3.0" />
         <PackageReference Include="System.Threading.Tasks" Version="4.3.0" />
-        <PackageReference Include="System.IO.Pipelines" Version="4.7.2" />
+        <PackageReference Include="System.IO.Pipelines" Version="4.7.3" />
         <PackageReference Include="Nerdbank.Streams" Version="2.6.81" />
     </ItemGroup>