chore(deps): update dependency stripe/stripe-ios to from: "23.28.0" (#1158)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [stripe/stripe-ios](https://togithub.com/stripe/stripe-ios) | minor |
`from: "23.27.6"` -> `from: "23.28.0"` |

---

### Release Notes

<details>
<summary>stripe/stripe-ios (stripe/stripe-ios)</summary>

###
[`v23.28.0`](https://togithub.com/stripe/stripe-ios/blob/HEAD/CHANGELOG.md#23280-2024-07-08)

[Compare
Source](https://togithub.com/stripe/stripe-ios/compare/23.27.6...23.28.0)

##### Payments

- \[Fixed] An issue where the correct card brand was not being displayed
for card brand choice in STPPaymentOptionsViewController and
STPPaymentContext.
- \[Added] Adds coupon support to STPApplePayContext with a new
`didChangeCouponCode` delegate method (h/t
[@&#8203;JoeyLeeMEA](https://togithub.com/JoeyLeeMEA)).
- \[Fixed] Fixed an issue where successful TWINT payments were sometimes
incorrectly considered 'canceled'.

</details>

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examples/stripe_example/Package.swift

@@ -7,7 +7,7 @@ let package = Package(
     dependencies: [
         .package(
             url: "https://github.com/stripe/stripe-ios",
-            from: "23.27.6"
+            from: "23.28.0"
         ),
     ]
 )