Update google-http-client version to fix CVE-2011-1498, CVE-2014-3577

[clementdenis]

Current google-http-client version (1.23.0) depends on org.apache.httpcomponents:httpclient:4.0.1, which has two known CVE vulnerabilities.
Recently released 1.25.0 google-http-client uses a newer version that is not affected.

[codecov-io]

Codecov Report

Merging #167 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #167      +/-   ##
============================================
- Coverage     80.11%   80.09%   -0.02%     
+ Complexity     1692     1691       -1     
============================================
  Files           157      157              
  Lines          5643     5643              
  Branches        738      738              
============================================
- Hits           4521     4520       -1     
  Misses          841      841              
- Partials        281      282       +1

Impacted Files	Coverage Δ	Complexity Δ
.../server/spi/discovery/CommonPathPrefixBuilder.java	94.44% <0%> (-5.56%)	8% <0%> (-1%)

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