Bump com.googlecode.maven-download-plugin:download-maven-plugin

Bumps [com.googlecode.maven-download-plugin:download-maven-plugin](https://github.com/maven-download-plugin/maven-download-plugin) from 1.7.1 to 1.8.1.
- [Release notes](https://github.com/maven-download-plugin/maven-download-plugin/releases)
- [Commits](download-maven-plugin/download-maven-plugin@1.7.1...1.8.1)

---
updated-dependencies:
- dependency-name: com.googlecode.maven-download-plugin:download-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

@@ -128,7 +128,7 @@
         <plugin>
           <groupId>com.googlecode.maven-download-plugin</groupId>
           <artifactId>download-maven-plugin</artifactId>
-          <version>1.7.1</version>
+          <version>1.8.1</version>
         </plugin>
         <plugin>
           <groupId>de.thetaphi</groupId>