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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This change is 

[dpebot]

/gcbrun

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (1d9a256) 93.66% compared to head (c46bea6) 93.66%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12007   +/-   ##
=======================================
  Coverage   93.66%   93.66%           
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  Files        1838     1838           
  Lines      166793   166793           
=======================================
+ Hits       156229   156232    +3     
+ Misses      10564    10561    -3     

see 5 files with indirect coverage changes

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