Upgrade to PowerShell v6.2.6 (#473)

Author: AnatoliB

src/Microsoft.Azure.Functions.PowerShellWorker.csproj

@@ -21,7 +21,7 @@ Licensed under the MIT license. See LICENSE file in the project root for full li
 
   <ItemGroup>
     <PackageReference Include="Grpc.Core" Version="2.27.0" />
-    <PackageReference Include="Microsoft.PowerShell.SDK" Version="6.2.5" />
+    <PackageReference Include="Microsoft.PowerShell.SDK" Version="6.2.6" />
     <PackageReference Include="CommandLineParser" Version="2.3.0" />
     <PackageReference Include="Google.Protobuf" Version="3.11.4" />
   </ItemGroup>

test/Unit/Microsoft.Azure.Functions.PowerShellWorker.Test.csproj

@@ -10,7 +10,7 @@
     <PackageReference Include="Moq" Version="4.12.0" />
     <PackageReference Include="xunit" Version="2.3.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
-    <PackageReference Include="Microsoft.PowerShell.SDK" Version="6.2.5" />
+    <PackageReference Include="Microsoft.PowerShell.SDK" Version="6.2.6" />
   </ItemGroup>
 
   <ItemGroup>