fix: set size for cached client secrets in DefaultAppleClientSecretGenerator

Specifying a size is required when IMemoryCache is configured with a SizeLimit (#1190)

Author: yasmoradi

src/AspNet.Security.OAuth.Apple/Internal/DefaultAppleClientSecretGenerator.cs

@@ -35,7 +35,7 @@ public override async Task<string> GenerateAsync([NotNull] AppleGenerateClientSe
                 Log.ClientSecretGenerationFailed(logger, ex, context.Scheme.Name);
                 throw;
             }
-        });
+        }, new MemoryCacheEntryOptions { Size = 1 });
 
         return clientSecret!;
     }