Expire product catalog cache entries after 10 minutes.

BulkPrintingAPI/Controllers/Utils.cs

             }
             return await cache.GetOrCreateAsync(key, entry =>
                 {
-                    // TODO: set expiry time, etc.
+                    entry.AbsoluteExpirationRelativeToNow = new TimeSpan(0, 10, 0);
                     return MAX.Utils.GetProductCatalogueAsync(clientFactory, logger, credentials);
                 }).ConfigureAwait(false);
         }