build(deps): bump org.jetbrains.gradle.plugin.idea-ext

Bumps org.jetbrains.gradle.plugin.idea-ext from 1.1.7 to 1.1.8.

---
updated-dependencies:
- dependency-name: org.jetbrains.gradle.plugin.idea-ext
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -5,7 +5,7 @@ plugins {
     id 'signing'
     id 'idea'
     id "org.sonarqube" version "5.0.0.4638"
-    id "org.jetbrains.gradle.plugin.idea-ext" version "1.1.7"
+    id "org.jetbrains.gradle.plugin.idea-ext" version "1.1.8"
     id 'io.codearte.nexus-staging' version '0.30.0'
 }