stabilize tests

src/Scanner/__Libraries/StellaOps.Scanner.Gate/CachingVexObservationProvider.cs

@@ -4,9 +4,10 @@
 // Description: Caching wrapper for VEX observation provider with batch prefetch.
 // -----------------------------------------------------------------------------
 
-using System.Collections.Immutable;
+
 using Microsoft.Extensions.Caching.Memory;
 using Microsoft.Extensions.Logging;
+using System.Collections.Immutable;
 
 namespace StellaOps.Scanner.Gate;