Bump io.openliberty.tools:liberty-gradle-plugin in /finish

Bumps [io.openliberty.tools:liberty-gradle-plugin](https://github.com/OpenLiberty/ci.gradle) from 3.7 to 3.8.2.
- [Release notes](https://github.com/OpenLiberty/ci.gradle/releases)
- [Commits](OpenLiberty/ci.gradle@liberty-gradle-plugin-3.7...liberty-gradle-plugin-3.8.2)

---
updated-dependencies:
- dependency-name: io.openliberty.tools:liberty-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

finish/build.gradle

@@ -21,7 +21,7 @@ buildscript {
     }
     dependencies {
         // tag::liberty-dependency[]
-        classpath 'io.openliberty.tools:liberty-gradle-plugin:3.7'
+        classpath 'io.openliberty.tools:liberty-gradle-plugin:3.8.2'
         // end::liberty-dependency[]
     }
 }