[Web PubSub] Add explicit reference to S.T.Encodings.Web to handle CVE-2021-26701 (#25270)

* Add explicit reference to S.T.Encodings.Web to handle CVE-2021-26701

* Add version override in packagereference

Author: Mohit-Chakraborty

sdk/webpubsub/Microsoft.Azure.WebPubSub.AspNetCore/src/Microsoft.Azure.WebPubSub.AspNetCore.csproj

@@ -13,6 +13,7 @@
   <ItemGroup>
     <FrameworkReference Include="Microsoft.AspNetCore.App" />
     <PackageReference Include="System.Text.Json" />
+    <PackageReference Include="System.Text.Encodings.Web" VersionOverride="4.7.2"/>
     <PackageReference Include="System.Memory.Data" />
   </ItemGroup>
 

sdk/webpubsub/Microsoft.Azure.WebPubSub.Common/src/Microsoft.Azure.WebPubSub.Common.csproj

@@ -12,6 +12,7 @@
 
   <ItemGroup>
     <PackageReference Include="System.Text.Json" />
+    <PackageReference Include="System.Text.Encodings.Web" VersionOverride="4.7.2"/>
     <PackageReference Include="System.Memory.Data" />
   </ItemGroup>