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 #21 into master will decrease coverage by 0.88%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #21      +/-   ##
============================================
- Coverage     74.87%   73.98%   -0.89%     
+ Complexity       97       89       -8     
============================================
  Files            11       11              
  Lines           589      569      -20     
  Branches          1        1              
============================================
- Hits            441      421      -20     
  Misses          147      147              
  Partials          1        1

Impacted Files	Coverage Δ	Complexity Δ
...igquery/storage/v1beta1/BigQueryStorageClient.java	68.75% <0%> (-1.84%)	16% <0%> (-3%)
...ery/storage/v1beta1/BaseBigQueryStorageClient.java	68.75% <0%> (-1.84%)	16% <0%> (-3%)
.../storage/v1beta1/stub/GrpcBigQueryStorageStub.java	92.62% <0%> (-0.51%)	11% <0%> (-1%)
...rage/v1beta1/stub/BigQueryStorageStubSettings.java	84.28% <0%> (-0.44%)	14% <0%> (ø)
...rage/v1beta1/stub/EnhancedBigQueryStorageStub.java	86% <0%> (-0.28%)	8% <0%> (-1%)

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