build(deps): bump org.grpcmock:grpcmock-junit5 from 0.8.0 to 0.15.0

Bumps [org.grpcmock:grpcmock-junit5](https://github.com/Fadelis/grpcmock) from 0.8.0 to 0.15.0.
- [Release notes](https://github.com/Fadelis/grpcmock/releases)
- [Commits](Fadelis/grpcmock@0.8.0...0.15.0)

---
updated-dependencies:
- dependency-name: org.grpcmock:grpcmock-junit5
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle.kts

@@ -166,7 +166,7 @@ configure(libs) {
             dependency("org.aspectj:aspectjweaver:${assertJVersion}")
             dependency("org.assertj:assertj-core:3.26.3")
             dependency("org.freemarker:freemarker:2.3.33")
-            dependency("org.grpcmock:grpcmock-junit5:0.8.0")
+            dependency("org.grpcmock:grpcmock-junit5:0.15.0")
             dependency("org.hamcrest:hamcrest:3.0")
             dependency("org.jboss.resteasy:resteasy-client:6.2.9.Final")
             dependency("org.mock-server:mockserver-netty:5.15.0")