Updating Stripe apiVersion to the latest (#745)

Documentation was using apiVersion: "2023-08-16" which is old but was also stating that apiVersion "2022-11-15" was what was being used which is old and not accurate.

_chapters/add-an-api-to-handle-billing.md

@@ -35,7 +35,7 @@ export const main = handler(async (event) => {
 
   // Load our secret key
   const stripe = new Stripe(Config.STRIPE_SECRET_KEY, {
-    apiVersion: "2023-08-16",
+    apiVersion: "2023-10-16",
   });
 
   await stripe.charges.create({
@@ -55,7 +55,7 @@ Most of this is fairly straightforward but let's go over it quickly:
 
 - We are using a `calculateCost(storage)` function (that we are going to add soon) to figure out how much to charge a user based on the number of notes that are going to be stored.
 
-- We create a new Stripe object using our Stripe Secret key. We are getting this from the environment variable that we configured in the [previous chapter]({% link _chapters/handling-secrets-in-sst.md %}). At the time of this guide's writing, we are using `apiVersion` `2022-11-15` but you can check the [Stripe documentation](https://stripe.com/docs/api/versioning){:target="_blank"} for the latest version.
+- We create a new Stripe object using our Stripe Secret key. We are getting this from the environment variable that we configured in the [previous chapter]({% link _chapters/handling-secrets-in-sst.md %}). At the time of this guide's writing, we are using `apiVersion` `2023-10-16` but you can check the [Stripe documentation](https://stripe.com/docs/api/versioning){:target="_blank"} for the latest version.
 
 - Finally, we use the `stripe.charges.create` method to charge the user and respond to the request if everything went through successfully.