deps: update dependency junit:junit to v4.13

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
junit:junit (source)	minor	4.12 -> 4.13

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[codecov]

Codecov Report

Merging #13 into master will increase coverage by 0.13%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #13      +/-   ##
============================================
+ Coverage     81.62%   81.75%   +0.13%     
  Complexity      532      532              
============================================
  Files            46       46              
  Lines          2286     2286              
  Branches        251      251              
============================================
+ Hits           1866     1869       +3     
+ Misses          300      297       -3     
  Partials        120      120

Impacted Files	Coverage Δ	Complexity Δ
.../cloud/datastore/testing/LocalDatastoreHelper.java	85.07% <0%> (+4.47%)	17% <0%> (ø)	⬇️

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