chore: bump up RevenueCat/purchases-ios-spm version to from: "5.56.1" (#14343)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[RevenueCat/purchases-ios-spm](https://redirect.github.com/RevenueCat/purchases-ios-spm)
| minor | `from: "5.55.3"` → `from: "5.56.1"` |

---

### Release Notes

<details>
<summary>RevenueCat/purchases-ios-spm
(RevenueCat/purchases-ios-spm)</summary>

###
[`v5.56.1`](https://redirect.github.com/RevenueCat/purchases-ios-spm/compare/5.56.0...5.56.1)

[Compare
Source](https://redirect.github.com/RevenueCat/purchases-ios-spm/compare/5.56.0...5.56.1)

###
[`v5.56.0`](https://redirect.github.com/RevenueCat/purchases-ios-spm/blob/HEAD/CHANGELOG.md#5560)

[Compare
Source](https://redirect.github.com/RevenueCat/purchases-ios-spm/compare/5.55.3...5.56.0)

#### 5.56.0

</details>

---

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packages/frontend/apps/ios/App/Packages/AffinePaywall/Package.swift

@@ -17,7 +17,7 @@ let package = Package(
   ],
   dependencies: [
     .package(path: "../AffineResources"),
-    .package(url: "https://github.com/RevenueCat/purchases-ios-spm.git", from: "5.55.3"),
+    .package(url: "https://github.com/RevenueCat/purchases-ios-spm.git", from: "5.56.1"),
   ],
   targets: [
     .target(