Bump keytool-maven-plugin from 1.5 to 1.6

Bumps [keytool-maven-plugin](https://github.com/mojohaus/keytool) from 1.5 to 1.6.
- [Release notes](https://github.com/mojohaus/keytool/releases)
- [Commits](mojohaus/keytool@keytool-1.5...keytool-1.6)

---
updated-dependencies:
- dependency-name: org.codehaus.mojo:keytool-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -73,7 +73,7 @@
     <maven.source.plugin.version>3.2.1</maven.source.plugin.version>
     <groovy.maven.plugin.version>2.1.1</groovy.maven.plugin.version>
     <groovy.all.version>2.4.21</groovy.all.version>
-    <keytool.maven.plugin.version>1.5</keytool.maven.plugin.version>
+    <keytool.maven.plugin.version>1.6</keytool.maven.plugin.version>
     <build.helper.maven-plugin.version>3.3.0</build.helper.maven-plugin.version>
     <maven.compiler.plugin.version>3.10.1</maven.compiler.plugin.version>
     <maven.surefire.plugin.version>2.22.2</maven.surefire.plugin.version>