Update gapic-generator hash (#762)
Update gapic-generator hash (#762)

To include the following features:
- Update generated java tests to use a unique InProcessChannel name (#3028)
- Assign the proto file where the method is defined (#3027) 
- Python: Include custom static files in generated Python docs (#3020)
- test: test streaming pagination for showcase (#3021)
- deprecate resource names not supported by microgenerators (#3016)
- Java samplegen: replace comment-out default lines with an overload of the sample function (#3019)
- samplegen: generate program.cs for c# samples (#3017)
- C# samplegen: remove commented-out lines showing default values of parameters (#3018)
- Add sample_type field to permit in-code samples. (#2996)
- pin jacoco to 0.8.5 for jdk 11 compatibility (#3009)
- Update dependency puppeteer to v2 (#3008)
googleapis/artman,googleapis/artman,googleapis/artman