Bump nexus-staging-maven-plugin from 1.6.8 to 1.6.13 (#617)

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

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

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -1017,7 +1017,7 @@
  <!-- Stick with this version of surefire, see Java 5 comments above -->
  <maven-surefire-report-plugin.version>2.21.0</maven-surefire-report-plugin.version>
  <maven-toolchains-plugin.version>3.1.0</maven-toolchains-plugin.version>
- <nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>
+ <nexus-staging-maven-plugin.version>1.6.13</nexus-staging-maven-plugin.version>
  <!-- Properties for maven-compiler-plugin -->
  <maven.compiler.compilerVersion>1.5</maven.compiler.compilerVersion>
  <maven.compiler.source>1.5</maven.compiler.source>