chore(librarian): update gapic-generator to 1.30.4

[parthea]

This PR is needed to address the following failure in the Kokoro Deps at HEAD Tests presubmit in PR #15468

________________ ERROR collecting tests/unit/test_writer_v1.py _________________
ImportError while importing test module '/tmpfs/src/github/google-cloud-python/packages/google-cloud-bigquery-storage/tests/unit/test_writer_v1.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/local/lib/python3.14/importlib/__init__.py:88: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
tests/unit/test_writer_v1.py:25: in 
    from google.cloud.bigquery_storage_v1 import exceptions as bqstorage_exceptions
google/cloud/bigquery_storage_v1/__init__.py:31: in 
    from google.cloud.bigquery_storage_v1 import client, types
google/cloud/bigquery_storage_v1/client.py:24: in 
    from google.api_core import gapic_v1
.nox/core_deps_from_source-protobuf_implementation-upb/lib/python3.14/site-packages/google/api_core/gapic_v1/__init__.py:18: in 
    from google.api_core.gapic_v1 import method
.nox/core_deps_from_source-protobuf_implementation-upb/lib/python3.14/site-packages/google/api_core/gapic_v1/method.py:24: in 
    from google.api_core import grpc_helpers
.nox/core_deps_from_source-protobuf_implementation-upb/lib/python3.14/site-packages/google/api_core/grpc_helpers.py:23: in 
    import google.auth.transport.grpc
.nox/core_deps_from_source-protobuf_implementation-upb/lib/python3.14/site-packages/google/auth/transport/grpc.py:23: in 
    from google.oauth2 import service_account
.nox/core_deps_from_source-protobuf_implementation-upb/lib/python3.14/site-packages/google/oauth2/service_account.py:78: in 
    from google.auth import _service_account_info
.nox/core_deps_from_source-protobuf_implementation-upb/lib/python3.14/site-packages/google/auth/_service_account_info.py:20: in 
    from google.auth import crypt
.nox/core_deps_from_source-protobuf_implementation-upb/lib/python3.14/site-packages/google/auth/crypt/__init__.py:41: in 
    from google.auth.crypt import es
.nox/core_deps_from_source-protobuf_implementation-upb/lib/python3.14/site-packages/google/auth/crypt/es.py:21: in 
    import cryptography.exceptions
E   ModuleNotFoundError: No module named 'cryptography'

See googleapis/gapic-generator-python#2527 for more details

[gemini-code-assist]

Summary of Changes

Hello @parthea, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical ModuleNotFoundError for the cryptography module that was causing failures in the Kokoro Deps at HEAD Tests presubmit. By upgrading the gapic-generator dependency to version 1.30.4, which includes cryptography in its constraints, the PR ensures the stability of the build process and prevents future test failures related to this missing dependency.

Highlights

• Dependency Update: Upgraded the gapic-generator dependency from version 1.30.3 to 1.30.4.
• Critical Bug Fix: This update resolves a ModuleNotFoundError for the cryptography module, which was causing failures in the Kokoro Deps at HEAD Tests presubmit.
• Dependency Resolution: The new gapic-generator version 1.30.4 explicitly adds cryptography to its constraints, ensuring its availability and preventing future build issues.

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[gemini-code-assist]

Code Review

This pull request updates the gapic-generator dependency from version 1.30.3 to 1.30.4. The change is intended to resolve a ModuleNotFoundError for the cryptography package that was causing failures in the CI/CD pipeline. The update is straightforward and correctly addresses the issue described. The change looks good.