Bump System.Threading.Tasks.Extensions to 4.6.3

Author: jstedfast

MailKit/MailKitLite.csproj

@@ -57,7 +57,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net4')) Or '$(TargetFramework)' == 'netstandard2.0' ">
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.6.0" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.6.3" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net4')) Or $(TargetFramework.StartsWith('netstandard')) Or '$(TargetFramework)' == 'net8.0' ">

nuget/MailKitLite.nuspec

@@ -51,17 +51,17 @@ Features include:
     <dependencies>
       <group targetFramework="net462">
         <dependency id="System.Formats.Asn1" version="8.0.1" />
-        <dependency id="System.Threading.Tasks.Extensions" version="4.6.0" />
+        <dependency id="System.Threading.Tasks.Extensions" version="4.6.3" />
         <dependency id="MimeKitLite" version="4.16.0" />
       </group>
       <group targetFramework="net47">
         <dependency id="System.Formats.Asn1" version="8.0.1" />
-        <dependency id="System.Threading.Tasks.Extensions" version="4.6.0" />
+        <dependency id="System.Threading.Tasks.Extensions" version="4.6.3" />
         <dependency id="MimeKitLite" version="4.16.0" />
       </group>
       <group targetFramework="net48">
         <dependency id="System.Formats.Asn1" version="8.0.1" />
-        <dependency id="System.Threading.Tasks.Extensions" version="4.6.0" />
+        <dependency id="System.Threading.Tasks.Extensions" version="4.6.3" />
         <dependency id="MimeKitLite" version="4.16.0" />
       </group>
       <group targetFramework="net8.0">