Bump io.micronaut.platform:micronaut-parent from 4.1.2 to 4.2.1

Bumps [io.micronaut.platform:micronaut-parent](https://github.com/micronaut-projects/micronaut-core) from 4.1.2 to 4.2.1.
- [Release notes](https://github.com/micronaut-projects/micronaut-core/releases)
- [Changelog](https://github.com/micronaut-projects/micronaut-core/blob/4.2.x/RELEASE.adoc)
- [Commits](micronaut-projects/micronaut-core@v4.1.2...v4.2.1)

---
updated-dependencies:
- dependency-name: io.micronaut.platform:micronaut-parent
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -10,7 +10,7 @@
     <parent>
         <groupId>io.micronaut.platform</groupId>
         <artifactId>micronaut-parent</artifactId>
-        <version>4.1.2</version>
+        <version>4.2.1</version>
     </parent>
     <properties>
         <packaging>jar</packaging>