Regenerate dialogflow 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-dialogflow/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:f1a2e851e5e012c59e1da4125480bb19878f86a4e7fac4f375f2e819956b5aa3
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/dialogflow/artman_dialogflow_v2.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running generator for google/cloud/dialogflow/artman_dialogflow_v2beta1_java.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running java formatter on 128 files
synthtool > Running java formatter on 6 files
synthtool > Running java formatter on 163 files
synthtool > Running java formatter on 8 files
synthtool > Running java formatter on 205 files
synthtool > Cleaned up 0 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #5776 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@ Coverage Diff @@## master #5776 +/- ##
============================================
- Coverage 47.17% 47.17% -0.01% + Complexity 25130 25115 -15 
============================================
Files 2389 2389 Lines 259836 259836 Branches 29417 29422 +5 ============================================
- Hits 122585 122579 -6 - Misses 128321 128327 +6 
Partials 8930 8930

Impacted Files	Coverage Δ	Complexity Δ
...e/cloud/dialogflow/v2/stub/AgentsStubSettings.java	87.54% <100%> (ø)	22 <0> (ø)	⬇️
...dialogflow/v2beta1/stub/DocumentsStubSettings.java	86.36% <100%> (ø)	19 <0> (ø)	⬇️
...d/dialogflow/v2beta1/stub/IntentsStubSettings.java	84.46% <100%> (ø)	19 <0> (ø)	⬇️
.../cloud/dialogflow/v2/stub/IntentsStubSettings.java	84.46% <100%> (ø)	19 <0> (ø)	⬇️
...ud/dialogflow/v2/stub/EntityTypesStubSettings.java	87.22% <100%> (ø)	25 <0> (ø)	⬇️
...ud/dialogflow/v2beta1/stub/AgentsStubSettings.java	87.54% <100%> (ø)	22 <0> (ø)	⬇️
...alogflow/v2beta1/stub/EntityTypesStubSettings.java	87.22% <100%> (ø)	25 <0> (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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