chore(deps): update dependency stripe/stripe-ios-spm to from: "24.15.0" (#1665)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[stripe/stripe-ios-spm](https://redirect.github.com/stripe/stripe-ios-spm)
| minor | `from: "24.14.0"` -> `from: "24.15.0"` |

---

### Release Notes

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

###
[`v24.15.0`](https://redirect.github.com/stripe/stripe-ios-spm/releases/tag/24.15.0)

[Compare
Source](https://redirect.github.com/stripe/stripe-ios-spm/compare/24.14.0...24.15.0)

#### 24.15.0 2025-06-02

##### Connect

- \[CHANGED] Removed `PrivateBetaConnect` annotation and all usages.
[Connect
SDK](https://docs.stripe.com/connect/get-started-connect-embedded-components?platform=ios)
is now GA.

##### PaymentSheet

- \[Added] The ability to customize the height of the primary button
with `PaymentSheetAppearance.primaryButton.height`.
- \[Added] The ability to customize form insets with
`PaymentSheetAppearance.formInsets`.

</details>

---

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examples/stripe_example/Package.resolved

@@ -7,7 +7,7 @@ let package = Package(
     dependencies: [
         .package(
             url: "https://github.com/stripe/stripe-ios-spm.git",
-            from: "24.14.0"
+            from: "24.15.0"
         ),
     ]
 )