Upgrade gson from 2.8.2 to 2.8.5

[philipzhaoTS]

Which problem is this PR solving?

• Update jaeger-core to depend gson 2.8.5 #580

Short description of the changes

• Update gson to the newest library

[codecov]

Codecov Report

Merging #584 into master will increase coverage by 0.1%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             master    #584     +/-   ##
==========================================
+ Coverage      89.5%   89.6%   +0.1%     
  Complexity      539     539             
==========================================
  Files            68      68             
  Lines          1944    1944             
  Branches        250     250             
==========================================
+ Hits           1740    1742      +2     
+ Misses          130     128      -2     
  Partials         74      74

Impacted Files	Coverage Δ	Complexity Δ
...egertracing/internal/reporters/RemoteReporter.java	84.88% <0%> (+2.32%)	7% <0%> (ø)	⬇️

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[yurishkuro]

try git commit -s --amend to have it signed