Bump org.mozilla:rhino from 1.7.14 to 1.7.15

Bumps [org.mozilla:rhino](https://github.com/mozilla/rhino) from 1.7.14 to 1.7.15.
- [Release notes](https://github.com/mozilla/rhino/releases)
- [Changelog](https://github.com/mozilla/rhino/blob/master/RELEASE-NOTES.md)
- [Commits](https://github.com/mozilla/rhino/commits)

---
updated-dependencies:
- dependency-name: org.mozilla:rhino
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

robot-server-core/build.gradle.kts

@@ -12,7 +12,7 @@ repositories {
 dependencies {
     api(project(":remote-robot"))
 
-    implementation("org.mozilla:rhino:1.7.14")
+    implementation("org.mozilla:rhino:1.7.15")
     implementation("org.assertj:assertj-swing:3.17.1")
     implementation("net.bytebuddy:byte-buddy-dep:1.14.14")