build(java): switch to release-please for release tagging

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[codecov]

Codecov Report

Merging #642 (104c2d2) into master (2a359a4) will increase coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #642      +/-   ##
============================================
+ Coverage     78.83%   78.88%   +0.05%     
  Complexity      379      379              
============================================
  Files            27       27              
  Lines          3420     3420              
  Branches        171      171              
============================================
+ Hits           2696     2698       +2     
+ Misses          651      650       -1     
+ Partials         73       72       -1     

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/com/google/cloud/pubsub/v1/Publisher.java	87.65% <0.00%> (+0.48%)	47.00% <0.00%> (ø%)

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