Fix SonarCloud code analysis

[rafaelfsilva]

SonarCloud code analysis has been broken for a while with the following error:

ERROR: SonarQube server [https://sonarqube.com] can not be reached
INFO: ------------------------------------------------------------------------
INFO: EXECUTION FAILURE
INFO: ------------------------------------------------------------------------
INFO: Total time: 19.583s
INFO: Final Memory: 3M/17M
INFO: ------------------------------------------------------------------------
ERROR: Error during SonarQube Scanner execution
org.sonarsource.scanner.api.internal.ScannerException: Unable to execute SonarQube
	at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:84)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:71)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory.createLauncher(IsolatedLauncherFactory.java:71)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory.createLauncher(IsolatedLauncherFactory.java:67)
	at org.sonarsource.scanner.api.EmbeddedScanner.doStart(EmbeddedScanner.java:218)
	at org.sonarsource.scanner.api.EmbeddedScanner.start(EmbeddedScanner.java:156)
	at org.sonarsource.scanner.cli.Main.execute(Main.java:74)
	at org.sonarsource.scanner.cli.Main.main(Main.java:61)
Caused by: java.lang.IllegalStateException: Fail to get bootstrap index from server
	at org.sonarsource.scanner.api.internal.Jars.getBootstrapIndex(Jars.java:100)
	at org.sonarsource.scanner.api.internal.Jars.getScannerEngineFiles(Jars.java:76)
	at org.sonarsource.scanner.api.internal.Jars.download(Jars.java:70)
	at org.sonarsource.scanner.api.internal.JarDownloader.download(JarDownloader.java:39)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:75)
	... 8 more
Caused by: java.lang.IllegalStateException: Status returned by url [https://sonarqube.com/batch/index] is not valid: [503]
	at org.sonarsource.scanner.api.internal.ServerConnection.callUrl(ServerConnection.java:115)
	at org.sonarsource.scanner.api.internal.ServerConnection.downloadString(ServerConnection.java:98)
	at org.sonarsource.scanner.api.internal.Jars.getBootstrapIndex(Jars.java:96)
	... 12 more
ERROR: 
ERROR: Re-run SonarQube Scanner using the -X switch to enable full debug logging.