use SDK 6.2.0 GA release

Author: eli-darkly

src/LaunchDarkly.ServerSdk.Redis/LaunchDarkly.ServerSdk.Redis.csproj

@@ -21,7 +21,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="LaunchDarkly.ServerSdk" Version="6.1.0-alpha.bigsegments.2" />
+    <PackageReference Include="LaunchDarkly.ServerSdk" Version="[6.2.0,7.0.0)" />
     <PackageReference Include="StackExchange.Redis" Version="[2.0.513,]" />
   </ItemGroup>