Bump animal-sniffer-maven-plugin from 1.17 to 1.21

Bumps [animal-sniffer-maven-plugin](https://github.com/mojohaus/animal-sniffer) from 1.17 to 1.21.
- [Release notes](https://github.com/mojohaus/animal-sniffer/releases)
- [Commits](https://github.com/mojohaus/animal-sniffer/compare/animal-sniffer-parent-1.17...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
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 4e26a3c..547f00f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,7 +61,7 @@
                 <plugin>
                     <groupId>org.codehaus.mojo</groupId>
                     <artifactId>animal-sniffer-maven-plugin</artifactId>
-                    <version>1.17</version>
+                    <version>1.21</version>
                 </plugin>
                 <plugin>
                     <artifactId>maven-changes-plugin</artifactId>