Bump nebula.release from 17.2.2 to 18.0.6

Bumps nebula.release from 17.2.2 to 18.0.6.

---
updated-dependencies:
- dependency-name: nebula.release
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

settings.gradle.kts

@@ -21,7 +21,7 @@ pluginManagement {
     id("com.github.johnrengelman.shadow") version "8.1.1"
     id("com.google.cloud.tools.jib") version "3.4.0"
     id("io.github.gradle-nexus.publish-plugin") version "1.3.0"
-    id("nebula.release") version "17.2.2"
+    id("nebula.release") version "18.0.6"
     id("org.springframework.boot") version "2.7.17"
     id("org.owasp.dependencycheck") version "8.4.0"
   }