Bump nexus-staging-maven-plugin from 1.6.8 to 1.6.13 (#72)

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
...

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

Author: dependabot[bot]

pom.xml

@@ -231,7 +231,7 @@
           <plugin>
             <groupId>org.sonatype.plugins</groupId>
             <artifactId>nexus-staging-maven-plugin</artifactId>
-            <version>1.6.8</version>
+            <version>1.6.13</version>
             <extensions>true</extensions>
             <configuration>
               <serverId>sonatype-nexus-staging</serverId>