chore(deps): update dependency apple/swift-markdown to v0.7.1 (#1830)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[apple/swift-markdown](https://redirect.github.com/apple/swift-markdown)
| patch | `0.7.0` -> `0.7.1` |

---

### Release Notes

<details>
<summary>apple/swift-markdown (apple/swift-markdown)</summary>

###
[`v0.7.1`](https://redirect.github.com/swiftlang/swift-markdown/releases/tag/0.7.1):
Swift-Markdown 0.7.1

[Compare
Source](https://redirect.github.com/apple/swift-markdown/compare/0.7.0...0.7.1)

#### What's Changed

- \[Swift-Markdown 0.7.x] Guard unsafeFlags with Windows-only
conditional to restore SwiftPM compatibility by
[@&#8203;dlskawns96](https://redirect.github.com/dlskawns96) in
[https://github.com/swiftlang/swift-markdown/pull/242](https://redirect.github.com/swiftlang/swift-markdown/pull/242)

#### New Contributors

[@&#8203;dlskawns96](https://redirect.github.com/dlskawns96) with
[#&#8203;240](https://redirect.github.com/apple/swift-markdown/issues/240)
(cherry-picked as
[#&#8203;242](https://redirect.github.com/apple/swift-markdown/issues/242))

**Full Changelog**:
swiftlang/swift-markdown@0.7.0...0.7.1

</details>

---

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examples/ios_sim/Package.resolved

@@ -6,6 +6,6 @@ let package = Package(
     name: "ios_sim",
     dependencies: [
         .package(url: "https://github.com/apple/swift-nio.git", exact: "2.86.0"),
-        .package(url: "https://github.com/apple/swift-markdown.git", exact: "0.7.0"),
+        .package(url: "https://github.com/apple/swift-markdown.git", exact: "0.7.1"),
     ]
 )