Bump org.sonatype.plugins:nexus-staging-maven-plugin (#31)

Bumps org.sonatype.plugins:nexus-staging-maven-plugin from 1.6.13 to 1.7.0.

---
updated-dependencies:
- dependency-name: org.sonatype.plugins:nexus-staging-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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