audit work, fixed StellaOps.sln warnings/errors, fixed tests, sprints work, new advisories

src/Notifier/StellaOps.Notifier/StellaOps.Notifier.WebService/Program.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using System.Collections.Immutable;
+using System.Globalization;
 using System.Text;
 using System.Text.Json;
 using System.Text.Json.Nodes;
@@ -970,7 +971,7 @@ app.MapPost("/api/v2/notify/deliveries/{deliveryId}/retry", async (
         deliveryId,
         retried = true,
         newAttemptNumber,
-        scheduledAt = now.ToString("O"),
+        scheduledAt = now.ToString("O", CultureInfo.InvariantCulture),
         message = "Delivery scheduled for retry"
     });
 });