Datastore : cleanup dependency

[athakor]

towards #4383

[codecov]

Codecov Report

Merging #5687 into master will decrease coverage by 0.37%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #5687 +/- ##
============================================
- Coverage 46.71% 46.34% -0.38% + Complexity 24629 23227 -1402 
============================================
Files 2351 2351 Lines 256127 251098 -5029 Branches 29325 29172 -153 ============================================
- Hits 119648 116361 -3287 + Misses 127559 126724 -835 + Partials 8920 8013 -907

Impacted Files	Coverage Δ	Complexity Δ
...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%)
...ogle/cloud/texttospeech/v1/TextToSpeechClient.java	55.88% <0%> (-2.46%)	9% <0%> (-2%)
...cloud/texttospeech/v1beta1/TextToSpeechClient.java	55.88% <0%> (-2.46%)	9% <0%> (-2%)
...oogle/cloud/language/v1/LanguageServiceClient.java	79.16% <0%> (-2.32%)	26% <0%> (-9%)
... and 603 more

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