Bump nexus-staging-maven-plugin from 1.6.8 to 1.6.13

[dependabot[bot]]

Bumps nexus-staging-maven-plugin from 1.6.8 to 1.6.13.

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[codecov[bot]]

Codecov Report

Merging #214 (ab9ec46) into master (1d87157) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #214   +/-   ##
=========================================
  Coverage     65.99%   65.99%           
  Complexity      733      733           
=========================================
  Files            53       53           
  Lines          2838     2838           
  Branches        442      442           
=========================================
  Hits           1873     1873           
  Misses          821      821           
  Partials        144      144           

Flag	Coverage Δ
unit-tests	65.99% <ø> (ø)

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