(testing, no need to review) update libraries-bom to 26.37.0

[zhumin8]

Update google_cloud_platform_libraries_bom to 26.38.0. Associated updates to google_cloud_spanner_version, gax_version, guava and protobuf_version.

Note: libraries-bom to 26.38.0 is not available yet, raising pr to test for now with 26.37.0.

---

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[github-actions]

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[zhumin8]

error message from "PreCommit Java Pulsar IO Direct"

> Task :sdks:java:io:pulsar:test

org.apache.beam.sdk.io.pulsar.PulsarIOTest > testReadFromSimpleTopic FAILED
    org.apache.beam.sdk.Pipeline$PipelineExecutionException at PulsarIOTest.java:178
        Caused by: java.lang.IllegalArgumentException at Preconditions.java:445

10 tests completed, 1 failed

log for PreCommit Java:

* What went wrong:
Execution failed for task ':runners:java-fn-execution:test'.
> There were failing tests. See the report at: file:///runner/_work/beam/beam/runners/java-fn-execution/build/reports/tests/test/index.html

[suztomo]

Taking over

[suztomo]

Run Java Postcommit

[suztomo]

Run Java_PVR_Flink_Batch PreCommit

[suztomo]

Run Java Spark PortableValidatesRunner Batch

[suztomo]

Run PostCommit_Java_DataflowV2