Revert "Bumps Application Insights version (#342) (#343)"

This reverts commit 30fe1eb.

Author: rossgrambo

src/Microsoft.FeatureManagement.Telemetry.ApplicationInsights/Microsoft.FeatureManagement.Telemetry.ApplicationInsights.csproj

@@ -32,7 +32,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.ApplicationInsights" Version="2.22.0" />
+    <PackageReference Include="Microsoft.ApplicationInsights" Version="2.21.0" />
   </ItemGroup>
 
   <ItemGroup>