fix: Ensures that the parsed value is within the bounds of int32

Fix code scanning alert no. 2: Incorrect conversion between integer types

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
Signed-off-by: Bruce Huang <weichou1229@gmail.com>

internal/driver/subscriptionrequest.go

@@ -93,10 +93,11 @@ func newSubscriptionRequest(attributes map[string]interface{}, requestData []byt
 
 	messageLimit, ok := attributes[DefaultMessageLimit]
 	if request.MessageLimit == nil && ok {
-		val, err := strconv.Atoi(fmt.Sprint(messageLimit))
+		val64, err := strconv.ParseInt(fmt.Sprint(messageLimit), 10, 32)
 		if err != nil {
 			return nil, errors.NewCommonEdgeX(errors.KindServerError, fmt.Sprintf("failed to parse the request attribute '%s'", DefaultMessageLimit), err)
 		}
+		val := int(val64)
 		request.MessageLimit = &val
 	}
 	return request, nil