Bump org.junit:junit-bom from 5.10.2 to 5.10.3

Bumps [org.junit:junit-bom](https://github.com/junit-team/junit5) from 5.10.2 to 5.10.3.
- [Release notes](https://github.com/junit-team/junit5/releases)
- [Commits](junit-team/junit5@r5.10.2...r5.10.3)

---
updated-dependencies:
- dependency-name: org.junit:junit-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle.kts

@@ -22,7 +22,7 @@ dependencies {
 
     testImplementation("org.apache.flink:flink-test-utils:$flinkVersion")
     testImplementation("org.apache.flink:flink-core:$flinkVersion:tests")
-    testImplementation(platform("org.junit:junit-bom:5.10.2"))
+    testImplementation(platform("org.junit:junit-bom:5.10.3"))
     testImplementation("org.junit.jupiter:junit-jupiter")
     testImplementation("org.junit.vintage:junit-vintage-engine")
 }