deps: update dependency org.graalvm.buildtools:native-maven-plugin to v0.9.20 (#1485)

* deps: update dependency org.graalvm.buildtools:native-maven-plugin to v0.9.20 * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md --------- Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: renovate-bot

samples/native-image-sample/pom.xml

@@ -134,7 +134,7 @@ http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <plugin>
  <groupId>org.graalvm.buildtools</groupId>
  <artifactId>native-maven-plugin</artifactId>
- <version>0.9.19</version>
+ <version>0.9.20</version>
  <extensions>true</extensions>
  <configuration>
  <mainClass>pubsub.NativeImagePubSubSample