Upgrade to SonarQube 8.5

Minor upgrade to Docker container executed successfully with some fiddling around, because of some plugins being stored internally:

• sonar-vbnet-plugin
• sonar-kotlin-plugin
• sonar-ruby-plugin
• sonar-scala-plugin
• sonar-xml-plugin
• sonar-java-plugin
• sonar-javascript-plugin
• sonar-flex-plugin
• sonar-go-plugin
• sonar-html-plugin
• sonar-python-plugin
• sonar-jacoco-plugin
• sonar-csharp-plugin
• sonar-css-plugin
• sonar-php-plugin

SonarQube 8.5