Fix SARIF validation failure

[chao2zhang]

When trying the relative output of SARIF report, the official validation tool yields the following failure:

[codecov]

Codecov Report

Merging #3507 (a328e5b) into master (c90eafe) will decrease coverage by 0.01%.
The diff coverage is 40.00%.

@@             Coverage Diff              @@
##             master    #3507      +/-   ##
============================================
- Coverage     77.62%   77.61%   -0.02%     
  Complexity     2806     2806              
============================================
  Files           461      461              
  Lines          8672     8676       +4     
  Branches       1676     1678       +2     
============================================
+ Hits           6732     6734       +2     
  Misses         1035     1035              
- Partials        905      907       +2     

Impacted Files	Coverage Δ	Complexity Δ
...io/github/detekt/report/sarif/SarifOutputReport.kt	90.47% <40.00%> (-4.27%)	4.00 <0.00> (ø)

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[BraisGabin]

It seems like SARIF babysits a lot.