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 #474 (a55addf) into master (f10bf0b) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #474   +/-   ##
=========================================
  Coverage     91.47%   91.47%           
  Complexity      243      243           
=========================================
  Files            26       26           
  Lines           927      927           
  Branches         67       67           
=========================================
  Hits            848      848           
  Misses           52       52           
  Partials         27       27           

[dependabot[bot]]

Superseded by #819.