chore(deps): update dependency com_google_googletest to v1.15.0 (#358)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [com_google_googletest](https://togithub.com/google/googletest) |
http_archive | minor | `v1.14.0` -> `v1.15.0` |

---

### Release Notes

<details>
<summary>google/googletest (com_google_googletest)</summary>

###
[`v1.15.0`](https://togithub.com/google/googletest/releases/tag/v1.15.0)

[Compare
Source](https://togithub.com/google/googletest/compare/v1.14.0...v1.15.0)

### Release Notes

GoogleTest will **not** accept patches of new features to the v1.15.x
branch.\
We recommend building GoogleTest from the latest commit instead.\
Exceptional critical bug fixes may be considered.

#### C++ Language Support

- GoogleTest requires at least C++14 and follows [Google's Foundational
C++ Support
Policy](https://opensource.google/documentation/policies/cplusplus-support).
See [this
table](https://togithub.com/google/oss-policies-info/blob/main/foundational-cxx-support-matrix.md)
for a list of currently supported versions compilers, platforms, and
build tools.

#### Notable Changes

- [Bzlmod](https://bazel.build/external/overview#bzlmod) is now
officially supported (previously it was supported by the community).
Note that it may take several days after the release for it to become
available in the [Bazel Central
Registry](https://registry.bazel.build/modules/googletest).
-   Many bug fixes

</details>

---

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tests/WORKSPACE

@@ -153,9 +153,9 @@ http_archive(
 # As a test dep of com_google_absl.
 http_archive(
     name = "com_google_googletest",
-    sha256 = "8ad598c73ad796e0d8280b082cebd82a630d73e73cd3c70057938a6501bba5d7",
-    strip_prefix = "googletest-1.14.0",
-    urls = ["https://github.com/google/googletest/archive/v1.14.0.tar.gz"],
+    sha256 = "7315acb6bf10e99f332c8a43f00d5fbb1ee6ca48c52f6b936991b216c586aaad",
+    strip_prefix = "googletest-1.15.0",
+    urls = ["https://github.com/google/googletest/archive/v1.15.0.tar.gz"],
 )
 
 http_archive(