Bump uk.org.webcompere:system-stubs-jupiter from 2.1.7 to 2.1.8 (#6094)

Bumps [uk.org.webcompere:system-stubs-jupiter](https://github.com/webcompere/system-stubs) from 2.1.7 to 2.1.8.
- [Release notes](https://github.com/webcompere/system-stubs/releases)
- [Changelog](https://github.com/webcompere/system-stubs/blob/main/History.md)
- [Commits](webcompere/system-stubs@system-stubs-parent-2.1.7...system-stubs-parent-2.1.8)

---
updated-dependencies:
- dependency-name: uk.org.webcompere:system-stubs-jupiter
  dependency-version: 2.1.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Diff for: gradle/libs.versions.toml

@@ -208,7 +208,7 @@ spring-cloud = { module = "org.springframework.cloud:spring-cloud-dependencies",
 spring-javaformatCheckstyle = { module = "io.spring.javaformat:spring-javaformat-checkstyle", version.ref = "spring-javaformat" }
 spring6-aop = { module = "org.springframework:spring-aop", version.ref = "spring6" }
 spring6-context = { module = "org.springframework:spring-context", version.ref = "spring6" }
-systemStubsJupiter = { module = "uk.org.webcompere:system-stubs-jupiter", version = "2.1.7" }
+systemStubsJupiter = { module = "uk.org.webcompere:system-stubs-jupiter", version = "2.1.8" }
 testcontainers-junitJupiter = { module = "org.testcontainers:junit-jupiter", version.ref = "testcontainers" }
 testcontainers-kafka = { module = "org.testcontainers:kafka", version.ref = "testcontainers" }
 testcontainers-postgresql = { module = "org.testcontainers:postgresql", version.ref = "testcontainers" }