deps: update dependency com.google.cloud:google-cloud-bigquerystorage-bom to v3.15.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-bigquerystorage-bom	3.14.1 -> 3.15.0

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Release Notes

googleapis/java-bigquerystorage (com.google.cloud:google-cloud-bigquerystorage-bom)

v3.15.0

Compare Source

Features

• bigquery: Integrate Otel Tracing in storage lib (#​2983) (c84fad6)
• Provide append() methods that accept com.google.gson objects (#​2985) (b8dff57)

Bug Fixes

• bigquery: Allow users to supply custom TracerProvider (#​2995) (88095e6)
• deps: Update the Java code generator (gapic-generator-java) to 2.58.0 (45d50bb)
• deps: Update the Java code generator (gapic-generator-java) to 2.59.0 (104571c)

Dependencies

• Update dependency com.google.cloud:google-cloud-bigquery to v2.50.1 (#​2981) (3869181)
• Update dependency com.google.cloud:sdk-platform-java-config to v3.49.0 (#​2989) (40a1b95)

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