Regenerate securitycenter 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-securitycenter/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/securitycenter/artman_securitycenter_v1beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running java formatter on 20 files
synthtool > Running java formatter on 1 files
synthtool > Running java formatter on 67 files
synthtool > Running generator for google/cloud/securitycenter/artman_securitycenter_v1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running java formatter on 20 files
synthtool > Running java formatter on 1 files
synthtool > Running java formatter on 72 files
synthtool > Cleaned up 0 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #5986 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@ Coverage Diff @@## master #5986 +/- ##
============================================
- Coverage 46.79% 46.79% -0.01% + Complexity 25663 25648 -15 
============================================
Files 2456 2456 Lines 267638 267640 +2 Branches 30559 30564 +5 ============================================
- Hits 125244 125240 -4 - Misses 133134 133140 +6 
Partials 9260 9260

Impacted Files	Coverage Δ	Complexity Δ
...ritycenter/v1/stub/SecurityCenterStubSettings.java	76.71% <100%> (+0.06%)	29 <1> (ø)	⬇️
...enter/v1beta1/stub/SecurityCenterStubSettings.java	76.71% <100%> (+0.06%)	29 <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)

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[chingor13]

Combined into a single pull request #6022