chore(deps): update dependency google_cloud_cpp to v2.13.0

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
google_cloud_cpp	http_archive	minor	v2.12.0 -> v2.13.0

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Release Notes

googleapis/google-cloud-cpp (google_cloud_cpp)

v2.13.0

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.

• Cloud Data Fusion
• Dataproc Metastore
• Migration Center
• Rapid Migration Assessment
• Secure Web Proxy

Batch

• docs: an example to extract Cloud Batch logs (#​11935)
• docs(batch): introduce basic snippets (#​11915)

Spanner

• doc(spanner): add an example for CommitAtLeastOnce() (#​11905)
• feat(spanner): implement at-least-once Commit (#​11899)

Common Libraries

• feat(generator): separate page for retry policy overrides (#​11950)
• fix(common): pagination must support empty pages (#​11937)
• feat(generator): create retry policy samples (#​11930)
• fix(common): use 64-bit API on Windows to get file sizes (#​11906)

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[dpebot]

/gcbrun