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 #131 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #131      +/-   ##
============================================
+ Coverage     81.21%   81.25%   +0.03%     
  Complexity      940      940              
============================================
  Files            96       96              
  Lines          5878     5878              
  Branches        327      327              
============================================
+ Hits           4774     4776       +2     
+ Misses          926      924       -2     
  Partials        178      178

Impacted Files	Coverage Δ	Complexity Δ
...om/google/cloud/bigtable/emulator/v2/Emulator.java	60.86% <0%> (+1.73%)	14% <0%> (ø)	⬇️

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