Regenerate bigquerydatatransfer 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-bigquerydatatransfer/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:9aed6bbde54e26d2fcde7aa86d9f64c0278f741e58808c46573e488cbf6098f0
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/bigquery/datatransfer/artman_bigquerydatatransfer.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running java formatter on 12 files
synthtool > Running java formatter on 2 files
synthtool > Running java formatter on 104 files
synthtool > Cleaned up 0 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #5818 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #5818 +/- ##
============================================
- Coverage 46.5% 46.47% -0.04% - Complexity 25648 25663 +15 
============================================
Files 2456 2456 Lines 267477 267593 +116 Branches 29752 30535 +783 ============================================
- Hits 124402 124373 -29 - Misses 133032 133146 +114 - Partials 10043 10074 +31

Impacted Files	Coverage Δ	Complexity Δ
...y/datatransfer/v1/DataTransferServiceSettings.java	12.72% <ø> (ø)	2 <0> (ø)	⬇️
...nsfer/v1/stub/DataTransferServiceStubSettings.java	80.62% <ø> (ø)	24 <0> (ø)	⬇️
...re/src/main/java/com/google/cloud/BaseService.java	55.55% <0%> (-6.95%)	2% <0%> (ø)
...ns/src/main/java/com/google/cloud/dns/DnsImpl.java	73.18% <0%> (-4.35%)	16% <0%> (ø)
...m/google/cloud/compute/deprecated/ComputeImpl.java	80.21% <0%> (-3.66%)	135% <0%> (ø)
...ain/java/com/google/cloud/logging/LoggingImpl.java	84.69% <0%> (-3.39%)	73% <0%> (ø)
...le/cloud/compute/deprecated/DeprecationStatus.java	88.63% <0%> (-3.13%)	20% <0%> (ø)
...s/src/main/java/com/google/cloud/dns/DnsBatch.java	87.87% <0%> (-2.68%)	20% <0%> (ø)
...java/com/google/cloud/compute/deprecated/Tags.java	87.23% <0%> (-2.13%)	16% <0%> (+1%)
...gle/cloud/resourcemanager/ResourceManagerImpl.java	85.71% <0%> (-1.91%)	15% <0%> (ø)
... and 176 more

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