SarifOutputReportSpec: Correctly detect Windows root directory on local development machine

[bedla]

Hi,
while experimenting with Detekt source code I found that test SarifOutputReportSpec is failing on my Windows machine because of C: vs D: Windows root dir detection. So I have created this PR to solve this problem.
Hope it helps and is ok,
Ivos

[codecov]

Codecov Report

Merging #3584 (23fc6c5) into main (c32b041) will increase coverage by 0.00%.
The diff coverage is 83.33%.

❗ Current head 23fc6c5 differs from pull request most recent head a51ea20. Consider uploading reports for the commit a51ea20 to get more accurate results

@@            Coverage Diff            @@
##               main    #3584   +/-   ##
=========================================
  Coverage     77.52%   77.53%           
- Complexity     2829     2835    +6     
=========================================
  Files           464      464           
  Lines          8767     8779   +12     
  Branches       1713     1720    +7     
=========================================
+ Hits           6797     6807   +10     
  Misses         1046     1046           
- Partials        924      926    +2     

Impacted Files	Coverage Δ	Complexity Δ
...in/kotlin/io/github/detekt/report/xml/XmlEscape.kt	64.28% <ø> (ø)	3.00 <0.00> (ø)
...turbosch/detekt/rules/bugs/NullableToStringCall.kt	76.19% <ø> (ø)	21.00 <0.00> (ø)
...t/rules/naming/NonBooleanPropertyPrefixedWithIs.kt	85.18% <ø> (ø)	12.00 <0.00> (ø)
...kt/rules/style/LibraryEntitiesShouldNotBePublic.kt	83.33% <ø> (ø)	7.00 <0.00> (ø)
...b/arturbosch/detekt/rules/style/UseCheckNotNull.kt	90.00% <ø> (ø)	3.00 <0.00> (-1.00)
...arturbosch/detekt/rules/style/UseRequireNotNull.kt	90.90% <ø> (ø)	5.00 <0.00> (ø)
...enerator/printer/rulesetpage/RuleSetPagePrinter.kt	86.36% <66.66%> (-1.45%)	18.00 <0.00> (+2.00)	⬇️
...urbosch/detekt/generator/collection/RuleVisitor.kt	82.45% <87.50%> (+0.38%)	43.00 <0.00> (+4.00)
...lab/arturbosch/detekt/generator/collection/Rule.kt	93.33% <100.00%> (+0.47%)	10.00 <1.00> (+1.00)

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[bedla]

Seems Gradle crashed badly, do I have to do something with it?

[chao2zhang]

No worries. This is a known flakiness. I will merge this PR.