chore(deps): update dependency build_bazel_rules_swift to v2.4.0 (#434)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[build_bazel_rules_swift](https://redirect.github.com/bazelbuild/rules_swift)
| http_archive | minor | `2.3.1` -> `2.4.0` |

---

### Release Notes

<details>
<summary>bazelbuild/rules_swift (build_bazel_rules_swift)</summary>

###
[`v2.4.0`](https://redirect.github.com/bazelbuild/rules_swift/releases/tag/2.4.0)

[Compare
Source](https://redirect.github.com/bazelbuild/rules_swift/compare/2.3.1...2.4.0)

#### What's Changed

- Fix for incremental compilation by
[@&#8203;adincebic](https://redirect.github.com/adincebic) in
[https://github.com/bazelbuild/rules_swift/pull/1476](https://redirect.github.com/bazelbuild/rules_swift/pull/1476)
- Run stardoc CI on older Bazel LTS by
[@&#8203;luispadron](https://redirect.github.com/luispadron) in
[https://github.com/bazelbuild/rules_swift/pull/1478](https://redirect.github.com/bazelbuild/rules_swift/pull/1478)
- Include swift_proto_library attrs in compilation by
[@&#8203;luispadron](https://redirect.github.com/luispadron) in
[https://github.com/bazelbuild/rules_swift/pull/1479](https://redirect.github.com/bazelbuild/rules_swift/pull/1479)

**Full Changelog**:
bazelbuild/rules_swift@2.3.1...2.4.0

This release is compatible with Bazel 6.x LTS, 7.x LTS, 8.x LTS, and 9.x
rolling releases.

#### MODULE.bazel Snippet

```bzl
bazel_dep(name = "rules_swift", version = "2.4.0", repo_name = "build_bazel_rules_swift")
```

#### Workspace Snippet

```bzl
load("@&#8203;bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(
    name = "build_bazel_rules_swift",
    sha256 = "28db894977ac51c8f3ab7c6dc9d655a85510366734e900b3c5302ce1ed91256c",
    url = "https://github.com/bazelbuild/rules_swift/releases/download/2.4.0/rules_swift.2.4.0.tar.gz",
)

load(
    "@&#8203;build_bazel_rules_swift//swift:repositories.bzl",
    "swift_rules_dependencies",
)

swift_rules_dependencies()

load(
    "@&#8203;build_bazel_rules_swift//swift:extras.bzl",
    "swift_rules_extra_dependencies",
)

swift_rules_extra_dependencies()
```

</details>

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---

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examples/custom_test_runner/WORKSPACE

@@ -41,8 +41,8 @@ swift_bazel_dependencies()
 
 http_archive(
     name = "build_bazel_rules_swift",
-    sha256 = "5bb49e7a1764f3f227677c572d6487b5bfeb2613eaaae2a82b240d9b836a0b4e",
-    url = "https://github.com/bazelbuild/rules_swift/releases/download/2.3.1/rules_swift.2.3.1.tar.gz",
+    sha256 = "28db894977ac51c8f3ab7c6dc9d655a85510366734e900b3c5302ce1ed91256c",
+    url = "https://github.com/bazelbuild/rules_swift/releases/download/2.4.0/rules_swift.2.4.0.tar.gz",
 )
 
 load("//:swift_deps.bzl", "swift_dependencies")