fix(srvless): slsfw version (#4999)

Author: thomas-tacquet

tutorials/send-emails-tem-serverless-framework/index.mdx

@@ -30,7 +30,7 @@ In this tutorial, you will learn how to send emails with [Transactional Email](/
 1. Open a terminal and paste the following command to install the Serverless Framework CLI on your local machine:
 
         ```
-        npm install serverless -g
+        npm install serverless@3.41 -g
         ```
 2. Clone the GitHub repository containing the configuration files needed to deploy your function:
         ```
@@ -91,4 +91,4 @@ The `go-mail` directory you have cloned contains a `.env` file in which you will
 8. Open your terminal and paste the following command to trigger your function. Make sure that you replace `$FUNCTION_DOMAIN` with your function's domain, `$FUNCTION_TOKEN` with the token you have generated, and `$MAIL_TO` with your recipient's email address. Optionally, you can also edit the `"subject"` and `"message"` fields.
         ```
         curl -v -X POST https://$FUNCTION_DOMAIN -H "X-Auth-Token: $FUNCTION_TOKEN" --data '{"to": "$MAILTO", "subject": "this is a test following the tem and serverless tuto", "message": "very very long message using the api"}'
-        ```
+        ```