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

src/Registry/StellaOps.Registry.TokenService/Program.cs

@@ -1,3 +1,4 @@
+using System.Globalization;
 using System.Net;
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authorization;
@@ -178,7 +179,7 @@ app.MapGet("/token", (
         {
             token = response.Token,
             expires_in = response.ExpiresIn,
-            issued_at = response.IssuedAt.UtcDateTime.ToString("O"),
+            issued_at = response.IssuedAt.UtcDateTime.ToString("O", CultureInfo.InvariantCulture),
             issued_token_type = "urn:ietf:params:oauth:token-type:access_token"
         });
     }