deps: update dependency org.easymock:easymock to v4

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
org.easymock:easymock	major	3.6 -> 4.2

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[codecov]

Codecov Report

Merging #39 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #39   +/-   ##
=========================================
  Coverage     79.88%   79.88%           
  Complexity      305      305           
=========================================
  Files            21       21           
  Lines          2600     2600           
  Branches        129      129           
=========================================
  Hits           2077     2077           
  Misses          467      467           
  Partials         56       56

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/google/cloud/pubsub/v1/StatusUtil.java	71.42% <0%> (ø)	4% <0%> (ø)	⬇️

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