Fix WhiteSource Bolt reporting

[epresi]

WhiteSource Bolt is not reporting since December 2019. As I found out the problem was that we are using an older version of the WS Bolt build task. After updating it to the latest (version 20), it works again.

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Performance improvement
• Refactoring (so no functional change)
• Other (docs, build config, etc)

Checklist:

• I've added tests for my code. (most of the time mandatory)
• I have added an entry to the changelog. (mandatory)
• My change requires a change to the documentation.
• I have updated the documentation accordingly.