Bump animal-sniffer-enforcer-rule from 1.20 to 1.21

Bumps [animal-sniffer-enforcer-rule](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-enforcer-rule
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -743,7 +743,7 @@ limitations under the License.
               <dependency>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>animal-sniffer-enforcer-rule</artifactId>
-                <version>1.20</version>
+                <version>1.21</version>
               </dependency>
             </dependencies>
             <executions>