Bump the gradle group in /codegen with 4 updates

Bumps the gradle group in /codegen with 4 updates: [org.junit:junit-bom](https://github.com/junit-team/junit-framework), [org.junit.jupiter:junit-jupiter-api](https://github.com/junit-team/junit-framework), [org.junit.jupiter:junit-jupiter-engine](https://github.com/junit-team/junit-framework) and [org.junit.jupiter:junit-jupiter-params](https://github.com/junit-team/junit-framework).


Updates `org.junit:junit-bom` from 6.0.2 to 6.0.3
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r6.0.2...r6.0.3)

Updates `org.junit.jupiter:junit-jupiter-api` from 6.0.2 to 6.0.3
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r6.0.2...r6.0.3)

Updates `org.junit.jupiter:junit-jupiter-engine` from 6.0.2 to 6.0.3
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r6.0.2...r6.0.3)

Updates `org.junit.jupiter:junit-jupiter-params` from 6.0.2 to 6.0.3
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r6.0.2...r6.0.3)

Updates `org.junit.jupiter:junit-jupiter-api` from 6.0.2 to 6.0.3
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r6.0.2...r6.0.3)

Updates `org.junit.jupiter:junit-jupiter-engine` from 6.0.2 to 6.0.3
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r6.0.2...r6.0.3)

Updates `org.junit.jupiter:junit-jupiter-params` from 6.0.2 to 6.0.3
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r6.0.2...r6.0.3)

---
updated-dependencies:
- dependency-name: org.junit:junit-bom
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
- dependency-name: org.junit.jupiter:junit-jupiter-api
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
- dependency-name: org.junit.jupiter:junit-jupiter-engine
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
- dependency-name: org.junit.jupiter:junit-jupiter-params
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
- dependency-name: org.junit.jupiter:junit-jupiter-api
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
- dependency-name: org.junit.jupiter:junit-jupiter-engine
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
- dependency-name: org.junit.jupiter:junit-jupiter-params
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: gradle
...

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

Author: dependabot[bot]

codegen/gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-junit5 = "6.0.2"
+junit5 = "6.0.3"
 smithy = "1.67.0"
 mockito = "5.21.0"
 test-logger-plugin = "4.0.0"