Bump io.quarkus.platform:quarkus-bom from 3.6.4 to 3.9.1

Bumps [io.quarkus.platform:quarkus-bom](https://github.com/quarkusio/quarkus-platform) from 3.6.4 to 3.9.1.
- [Commits](quarkusio/quarkus-platform@3.6.4...3.9.1)

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

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

build.gradle.kts

@@ -18,7 +18,7 @@ java {
 }
 
 val version: String by project
-val quarkusPlatformVersion = "3.6.4"
+val quarkusPlatformVersion = "3.9.1"
 val vaadinVersion = "24.3.2"
 
 repositories {