added related websites for vrt.be

[JO0st]

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[github-actions]

It appears you have failed some tests. Here are your results:
Encountered an inequality between the PR submission and the /.well-known/related-website-set.json file:
associatedSites was ['https://dewarmsteweek.be', 'https://sporza.be', 'https://een.be', 'https://klara.be', 'https://radio2.be', 'https://radio1.be'] in the PR, and ['https://dewarmsteweek.be', 'https://sporza.be', 'https://een.be', 'https://radio2.be', 'https://radio1.be'] in the well-known.
Diff was: ['https://klara.be'].
Experienced an error when trying to access https://klara.be/.well-known/related-website-set.json; error was: Expecting value: line 1 column 1 (char 0)