Upgraded animal-sniffer-maven-plugin from 1.20 to 1.21 (#489)

Bumps [animal-sniffer-maven-plugin](https://github.com/mojohaus/animal-sniffer) from 1.20 to 1.21.
- [Release notes](https://github.com/mojohaus/animal-sniffer/releases)
- [Commits](mojohaus/animal-sniffer@animal-sniffer-parent-1.20...animal-sniffer-parent-1.21)

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

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

pom.xml

@@ -481,7 +481,7 @@
         <plugin>
           <groupId>org.codehaus.mojo</groupId>
           <artifactId>animal-sniffer-maven-plugin</artifactId>
-          <version>1.20</version>
+          <version>1.21</version>
         </plugin>
         <plugin>
           <groupId>org.jetbrains.dokka</groupId>