chore(deps): update plugin org.sonarqube to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.sonarqube	4.0.0.2929 -> 6.2.0.5505

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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This PR was generated by Mend Renovate. View the repository job log.

[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: build.gradle

Command failed: ./gradlew --console=plain --dependency-verification lenient -q :dependencies --update-locks org.sonarqube:org.sonarqube.gradle.plugin

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'embulk-input-randomj'.
> Could not resolve all artifacts for configuration 'classpath'.
   > Could not resolve org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:6.2.0.5505.
     Required by:
         root project : > org.sonarqube:org.sonarqube.gradle.plugin:6.2.0.5505
      > Dependency requires at least JVM runtime version 11. This build uses a Java 8 JVM.

* Try:
> Run this build using a Java 11 or newer JVM.
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

BUILD FAILED in 22s