Update to Error Prone 2.39.0

[msridhar]

Fix some warnings from new check PreferInstanceofOverGetKind

[msridhar]

@yuxincs required job names will need to be updated

[codecov]

Codecov Report

❌ Patch coverage is 58.33333% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.32%. Comparing base (5b22fb4) to head (341c6b9).
⚠️ Report is 188 commits behind head on master.

Files with missing lines	Patch %	Lines
...away/src/main/java/com/uber/nullaway/NullAway.java	75.00%	0 Missing and 2 partials ⚠️
...dlers/FieldInitializationSerializationHandler.java	0.00%	0 Missing and 1 partial ⚠️
...m/uber/nullaway/handlers/LibraryModelsHandler.java	0.00%	0 Missing and 1 partial ⚠️
...er/nullaway/handlers/OptionalEmptinessHandler.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1228   +/-   ##
=========================================
  Coverage     88.31%   88.32%           
  Complexity     2356     2356           
=========================================
  Files            89       89           
  Lines          7668     7666    -2     
  Branches       1536     1534    -2     
=========================================
- Hits           6772     6771    -1     
  Misses          450      450           
+ Partials        446      445    -1     

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[yuxincs]

@yuxincs required job names will need to be updated

Done! :)