Regenerate spanner client

[yoshi-automation]

This PR was generated using Autosynth. 🌈

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: sha256:545c758c76c3f779037aa259023ec3d1ef2d57d2c8cd00a222cb187d63ceac5e
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 190 files
synthtool > Running java formatter on 1 files
synthtool > Running java formatter on 80 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 32 files
synthtool > Cleaned up 0 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[skuruppu]

Approved but following up with @kolea2 offline on how to fix the underlying issue so that the code generation doesn't include the spurious "com.google.iam.v1." prefix.

[codecov]

Codecov Report

Merging #6731 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #6731   +/-   ##
=========================================
  Coverage     46.37%   46.37%           
  Complexity    28024    28024           
=========================================
  Files          2614     2614           
  Lines        288317   288317           
  Branches      33810    33810           
=========================================
  Hits         133715   133715           
  Misses       144336   144336           
  Partials      10266    10266

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