Bump nexus-staging-maven-plugin from 1.6.12 to 1.6.13

Bumps nexus-staging-maven-plugin from 1.6.12 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>
diff --git a/pom.xml b/pom.xml
index 5becb71..ef1276d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -315,7 +315,7 @@
       <plugin>
         <groupId>org.sonatype.plugins</groupId>
         <artifactId>nexus-staging-maven-plugin</artifactId>
-        <version>1.6.12</version>
+        <version>1.6.13</version>
         <extensions>true</extensions>
         <configuration>
           <serverId>rao</serverId>