chore(deps): update dependency google_cloud_cpp to v2.26.0

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
google_cloud_cpp	http_archive	minor	v2.25.0 -> v2.26.0

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Release Notes

googleapis/google-cloud-cpp (google_cloud_cpp)

v2.26.0

Compare Source

BREAKING TESTING CHANGES

If you don't mock Long Running Operations (LRO) in your tests, then these
changes will not affect you.

With the addition of new methods to support starting Long Running Operations
(LRO) synchronously and awaiting their completion separately, the overload set
for the preexisting LRO methods have been expanded. Uses of EXPECT_CALL that
do not have matchers for the arguments will be ambiguous. To quickly remedy this
change instances of EXPECT_CALL(*mock, Method) to
EXPECT_CALL(*mock, Method(::testing::_)).

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.

• Managed Kafka API

Updated Libraries

• Discovery Engine:
  • ControlServiceClient added
  • GroundedGenerationServiceClient added
  • ProjectServiceClient added
  • RankServiceClient added

Bigtable

• docs(bigtable): include admin options (#​14358)

Pub/Sub

• docs(pubsub): include admin options (#​14359)

Spanner

• docs(spanner): include admin options (#​14360)

Storage

• feat(storage): support object retention (#​14351)
• feat(storage): buckets with object retention (#​14350)

StorageControl

• samples(storagecontrol): add storagecontrol managed folder samples (#​14356)
• samples(storagecontrol): add storagecontrol folder samples (#​14332)

Common Libraries

• New (experimental) functions to start a LRO (longrunning operation) in one
  function call, and then awaiting for the LRO to complete on a separate
  function.
• fix(otel): async read stream tracing (#​14393)
• fix(otel): async write stream tracing (#​14394)
• feat(otel): capture error message in traces (again) (#​14389)
• doc: document Start and Await methods and mocks (#​14375)
• fix(otel): async read write stream tracing (#​14379)

Google APIs interface definitions

• This release is based on definitions as of 2024-06-24T13:34:42-07:00

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This change is 

[dpebot]

/gcbrun

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.58%. Comparing base (81505b7) to head (420f7fd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14410   +/-   ##
=======================================
  Coverage   93.58%   93.58%           
=======================================
  Files        2313     2313           
  Lines      206885   206885           
=======================================
+ Hits       193612   193618    +6     
+ Misses      13273    13267    -6     

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