Bump io.smallrye:jandex-maven-plugin from 3.1.2 to 3.1.8

Bumps [io.smallrye:jandex-maven-plugin](https://github.com/smallrye/jandex) from 3.1.2 to 3.1.8.
- [Release notes](https://github.com/smallrye/jandex/releases)
- [Changelog](https://github.com/smallrye/jandex/blob/main/RELEASE_PROCEDURE.md)
- [Commits](smallrye/jandex@3.1.2...3.1.8)

---
updated-dependencies:
- dependency-name: io.smallrye:jandex-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

examples/quarkus-car-booking/pom.xml

@@ -113,7 +113,7 @@
             <plugin>
                 <groupId>io.smallrye</groupId>
                 <artifactId>jandex-maven-plugin</artifactId>
-                <version>3.1.2</version>
+                <version>3.1.8</version>
                 <executions>
                     <execution>
                         <id>make-index</id>