Regenerate datalabeling 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-datalabeling/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:a44d9fb6fe826ca0ea7d6f7be23c596346bed82ee513a0043f3c068279717439
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/datalabeling/artman_datalabeling_v1beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running java formatter on 10 files
synthtool > Running java formatter on 1 files
synthtool > Running java formatter on 284 files
synthtool > Cleaned up 0 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #5748 into master will not change coverage.
The diff coverage is n/a.

@@ Coverage Diff @@## master #5748 +/- ##
=========================================
Coverage 47.09% 47.09% + Complexity 25079 25064 -15 
=========================================
Files 2389 2389 Lines 259750 259750 Branches 29400 29405 +5 =========================================
Hits 122328 122328 Misses 128459 128459 Partials 8963 8963

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