[api]: Bump io.objectbox:objectbox-gradle-plugin from 4.0.2 to 4.0.3

Bumps [io.objectbox:objectbox-gradle-plugin](https://github.com/objectbox/objectbox-java-generator) from 4.0.2 to 4.0.3.
- [Commits](https://github.com/objectbox/objectbox-java-generator/commits)

---
updated-dependencies:
- dependency-name: io.objectbox:objectbox-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle.kts

@@ -5,7 +5,7 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 buildscript {
     dependencies {
         classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.21")
-        classpath("io.objectbox:objectbox-gradle-plugin:4.0.2")
+        classpath("io.objectbox:objectbox-gradle-plugin:4.0.3")
         classpath("com.gradleup.shadow:shadow-gradle-plugin:8.3.3")
     }