deps: update googleapis/sdk-platform-java action to v2.68.0

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
googleapis/sdk-platform-java	action	minor	v2.67.0 → v2.68.0

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Release Notes

googleapis/sdk-platform-java (googleapis/sdk-platform-java)

v2.68.0

Compare Source

Features

• Add client request duration metric. (#​4132) (6a76397)
• Add more attributes to golden signals metrics. (#​4135) (59d0624)
• gax-httpjson: add HttpJsonErrorParser utility (#​4137) (a1b7565)
• generator: add extra allowed modules that will not be removed from the monorepo if they are present (#​4124) (774fe6e)
• o11y: introduce gcp.client.repo and gcp.client.artifact attributes (#​4120) (105f644)
• o11y: Introduce rpc.system.name and rpc.method in gRPC (#​4121) (7ab6d2e)
• o11y: introduce server.port attribute (#​4128) (56aa343)

Bug Fixes

• add null checks for ApiTracerFactory in ClientContext (#​4122) (4b3dbe2)
• Decrease log level for directpath warnings outside GCE (#​4139) (c9651e7)
• gax-grpc: add pick_first fallback to direct path service config (#​4143) (b150fe9)
• Populate method level attributes in metrics recording (#​4149) (7b7e6c9)
• suppress warnings in generated projects for non-idiomatic durations (#​4119) (4206e6e)
• Use ServiceName + MethodName as the regex for Otel (#​2543) (b9ae73f)

Documentation

• hermetic_build: fix config field name in readme (#​4130) (a0c8f67)

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