chore(deps): update dependency google_cloud_cpp to v2.16.0

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
google_cloud_cpp	http_archive	minor	v2.15.1 -> v2.16.0

---

Release Notes

googleapis/google-cloud-cpp (google_cloud_cpp)

v2.16.0

Compare Source

New Libraries

We are happy to announce the following GA libraries. Unless specifically noted,
the APIs in these libraries are stable, and are ready for production use.

• Compute Engine
• Infrastructure Manager
• NetApp

Discovery Engine

New *Client for conversational search.

OAuth2

• feat(oauth2): add quickstart, README, etc.
  (#​12754)

OpenTelemetry

We instrumented the Google Cloud C++ libraries for [distributed tracing] using
[OpenTelemetry]. All client libraries are instrumented in some capacity.

Features to enable the collection and export of these traces are now GA. See the
[quickstart][otel-quickstart] within the library to learn more about these
tools.

Policy Troubleshooter

Remove PoliciesClient. This client was placed in the wrong library. The
correct location is google/cloud/iam/v2.

Storage

• fix(storage): trace auth when default credentials are assumed
  (#​12672)
• docs(storage): more on InsertObject vs. WriteObject
  (#​12577)

Common Libraries

• feat(common): new *Option to configure HTTP proxy
  (#​12766)
• fix: export headers with top-level Bazel targets
  (#​12762)
• fix: gRPC auth logging enabled by "auth"
  (#​12702)
• fix: add implicit routing in GAPICs
  (#​12544)

Known issues

Compiling gRPC with Bazel and Clang >= 16 requires --features=-layering_check
in your Bazel command-line. For more details, see [grpc#34482].

---

Configuration

📅 Schedule: Branch creation - "every weekday" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.

[dpebot]

/gcbrun