Upgrade mssql-jdbc driver to 6.2.2.jre8

With SQ 6.1 (SONAR-8547), the embedded MS SQL JDBC driver is now coming from Maven Central and its version is 6.1.0.jre8.

• Microsoft is recommending to use the v6.2.1.jre8 (https://docs.microsoft.com/en-us/sql/connect/jdbc/release-notes-for-the-jdbc-driver) but 6.2.2.jr8 is out since October 4th
• In the sonar.properties, we say that: "This version of SonarQube has been tested with Microsoft SQL JDBC version 4.1", this should be removed
• In the sonar.properties, the link to DLL must be updated to point to version 6.2 (https://www.microsoft.com/en-us/download/details.aspx?id=55539)