Convert buildSrc to using kts

[Kietyo]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 31.57% and project coverage change: -0.40% ⚠️

Comparison is base (56e9a4a) 51.48% compared to head (8c96463) 51.09%.
Report is 4 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1830      +/-   ##
==========================================
- Coverage   51.48%   51.09%   -0.40%     
==========================================
  Files        1750     1749       -1     
  Lines      102826   102833       +7     
  Branches    14519    14519              
==========================================
- Hits        52944    52541     -403     
- Misses      45913    46343     +430     
+ Partials     3969     3949      -20     

Flag	Coverage Δ
unittests	51.09% <31.57%> (-0.40%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...libs/korge/gradle/targets/desktop/DesktopCommon.kt	0.00% <0.00%> (ø)
buildSrc/src/main/kotlin/korlibs/tools.kt	0.00% <0.00%> (ø)
...Main/kotlin/korlibs/render/DefaultGameWindowJvm.kt	0.00% <ø> (ø)
...in/kotlin/korlibs/render/platform/PlatformTools.kt	0.00% <ø> (ø)
...Main/kotlin/korlibs/render/x11/X11GameWindowJvm.kt	0.00% <0.00%> (ø)
...Main/kotlin/korlibs/korge/testing/testing_utils.kt	7.61% <66.66%> (-9.86%)	⬇️
...dMain/kotlin/korlibs/inject/AsyncInjectorJvmExt.kt	39.28% <100.00%> (-0.37%)	⬇️
...rc/commonTest/kotlin/korlibs/io/vfs/VfsFileTest.kt	87.07% <100.00%> (ø)

... and 54 files with indirect coverage changes

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