Update Microsoft.OpenApi.Readers (microsoft#2067)

Update to get this fix:
microsoft/OpenAPI.NET#1480

Author: Robulane

src/libraries/Microsoft.PowerFx.Connectors/Microsoft.PowerFx.Connectors.csproj

@@ -21,7 +21,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.OpenApi.Readers" Version="1.6.8" />   
+    <PackageReference Include="Microsoft.OpenApi.Readers" Version="1.6.11" />   
     <PackageReference Include="System.Text.Json" Version="6.0.8" />
     <PackageReference Include="System.Collections.Immutable" Version="6.0.0" />
     <PackageReference Include="System.Memory" Version="4.5.4" />