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] <support@github.com>

gradle/libs.versions.toml

@@ -17,7 +17,7 @@ embulk-util-text = "0.2.0"
 # It is to align with the restriction of embulk-util-json: https://github.com/embulk/embulk-util-json/pull/37
 jackson = { require = "2.15.4", prefer = "2.16.2" }
 
-junit5 = "5.10.2"
+junit5 = "5.10.3"
 embulk-util-rubytime = "0.4.0"
 
 checkstyle = "9.3"