Regenerate os-login 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-os-login/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:6929f343c400122d85818195b18613330a12a014bffc1e08499550d40571479d
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/oslogin/artman_oslogin_v1.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 24 files
synthtool > Cleaned up 0 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #5980 into master will decrease coverage by 0.38%.
The diff coverage is 100%.

@@ Coverage Diff @@## master #5980 +/- ##
============================================
- Coverage 46.79% 46.41% -0.39% + Complexity 25663 24189 -1474 
============================================
Files 2456 2456 Lines 267638 262401 -5237 Branches 30559 30414 -145 ============================================
- Hits 125244 121789 -3455 + Misses 133134 132283 -851 + Partials 9260 8329 -931

Impacted Files	Coverage Δ	Complexity Δ
...ud/oslogin/v1/stub/OsLoginServiceStubSettings.java	82.53% <100%> (-0.14%)	15 <1> (ø)
.../java/com/google/cloud/testing/CommandWrapper.java	87.87% <0%> (-9.1%)	13% <0%> (ø)
.../cloud/datastore/testing/LocalDatastoreHelper.java	80.59% <0%> (-4.48%)	17% <0%> (ø)
...m/google/cloud/vision/v1/ImageAnnotatorClient.java	58.69% <0%> (-3.31%)	15% <0%> (-4%)
...e/cloud/vision/v1p4beta1/ImageAnnotatorClient.java	58.69% <0%> (-3.31%)	15% <0%> (-4%)
...e/cloud/vision/v1p3beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
...e/cloud/vision/v1p2beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
.../java/com/google/cloud/speech/v1/SpeechClient.java	48.57% <0%> (-2.78%)	10% <0%> (-2%)
...om/google/cloud/speech/v1p1beta1/SpeechClient.java	48.57% <0%> (-2.78%)	10% <0%> (-2%)
...d/webrisk/v1beta1/WebRiskServiceV1Beta1Client.java	63.41% <0%> (-2.5%)	12% <0%> (-3%)
... and 631 more

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[chingor13]

Combined into a single pull request #6022