rspec: Google Cloud Spanner API samples update using dml failed

[flaky-bot]

This test failed!

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---

commit: 3a46e9e
buildURL: Build Status, Sponge
status: failed

Test output

Failure/Error:
  add_column project_id:  @project_id,
             instance_id: @instance.instance_id,
             database_id: database.database_id
Google::Cloud::DeadlineExceededError:

4:4:Deadline expired before operation could complete.. debug_error_string:{UNKNOWN:Error received from peer ipv4:173.194.193.95:443 {grpc_message:"Deadline expired before operation could complete.", grpc_status:4, created_time:"2023-07-26T23:11:22.144723868+00:00"}}

./spanner_samples.rb:547:in add_column' ./spec/spanner_samples_spec.rb:871:in block (3 levels) in <top (required)>'

./spec/spec_helper.rb:53:in capture' ./spec/spanner_samples_spec.rb:864:in block (2 levels) in <top (required)>'
--- Caused by: ---

GRPC::DeadlineExceeded:

4:Deadline expired before operation could complete.. debug_error_string:{UNKNOWN:Error received from peer ipv4:173.194.193.95:443 {grpc_message:"Deadline expired before operation could complete.", grpc_status:4, created_time:"2023-07-26T23:11:22.144723868+00:00"}}

./spanner_samples.rb:547:in `add_column'

[flaky-bot]

Test passed for commit ac1f4f3 (Build Status, Sponge)! Closing this issue.