TextToSpeech: Fix #4595 update default inbound msg size to max

[ajaaym]

Fixes#4595

[codecov]

Codecov Report

Merging #5883 into master will decrease coverage by 0.37%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #5883 +/- ##
============================================
- Coverage 46.79% 46.41% -0.38% + Complexity 25648 24189 -1459 
============================================
Files 2456 2456 Lines 267593 262358 -5235 Branches 30564 30414 -150 ============================================
- Hits 125225 121779 -3446 + Misses 133109 132251 -858 + Partials 9259 8328 -931

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 673 more

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[chingor13]

For these synth replacements, we want them to be mostly temporary and fix the issue upstream.

For this one, we should file a feature request to https://github.com/googleapis/gapic-generator to add a gapic config for the maxInboundMessageSize default and add a link to that bug in a comment here.