Regenerate spanner client

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/google-cloud-clients/google-cloud-spanner/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:f3d61ae45abaeefb6be5f228cda22732c2f1b00fb687c79c4bd4f2c42bb1e1a7
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/spanner/artman_spanner.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running generator for google/spanner/admin/database/artman_spanner_admin_database.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running generator for google/spanner/admin/instance/artman_spanner_admin_instance.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running java formatter on 156 files
synthtool > Running java formatter on 1 files
synthtool > Running java formatter on 76 files
synthtool > Running java formatter on 1 files
synthtool > Running java formatter on 25 files
synthtool > Running java formatter on 1 files
synthtool > Running java formatter on 30 files
synthtool > Cleaned up 0 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #4528 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #4528   +/-   ##
=========================================
  Coverage     49.15%   49.15%           
  Complexity    21934    21934           
=========================================
  Files          2077     2077           
  Lines        207174   207174           
  Branches      24099    24099           
=========================================
  Hits         101841   101841           
  Misses        97160    97160           
  Partials       8173     8173

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