Roll back to non snapshot spek version

[arturbosch]

Waiting for a new release - #2902

[arturbosch]

I've rolled back to 2.0.12 of Spek to fix #2976 .
Build should be 10-20 seconds slower now.

[codecov]

Codecov Report

Merging #2922 into master will decrease coverage by 0.54%.
The diff coverage is 84.37%.

@@             Coverage Diff              @@
##             master    #2922      +/-   ##
============================================
- Coverage     80.31%   79.77%   -0.55%     
- Complexity     2477     2493      +16     
============================================
  Files           424      424              
  Lines          7478     7490      +12     
  Branches       1369     1409      +40     
============================================
- Hits           6006     5975      -31     
- Misses          760      768       +8     
- Partials        712      747      +35     

Impacted Files	Coverage Δ	Complexity Δ
...io/gitlab/arturbosch/detekt/core/BindingContext.kt	6.25% <0.00%> (+0.36%)	0.00 <0.00> (ø)
...ab/arturbosch/detekt/core/settings/LoggingAware.kt	42.85% <50.00%> (ø)	0.00 <0.00> (ø)
...turbosch/detekt/rules/style/UnusedPrivateMember.kt	91.42% <86.66%> (+0.16%)	5.00 <0.00> (ø)
...ab/arturbosch/detekt/cli/DetektProgressListener.kt	83.33% <100.00%> (ø)	4.00 <0.00> (ø)
...tlin/io/gitlab/arturbosch/detekt/cli/JCommander.kt	91.30% <100.00%> (ø)	0.00 <0.00> (ø)
...gitlab/arturbosch/detekt/cli/runners/AstPrinter.kt	100.00% <100.00%> (ø)	4.00 <0.00> (ø)
...ab/arturbosch/detekt/cli/runners/ConfigExporter.kt	75.00% <100.00%> (ø)	2.00 <0.00> (ø)
...ab/arturbosch/detekt/cli/runners/ElementPrinter.kt	96.42% <100.00%> (ø)	11.00 <0.00> (ø)
...ab/arturbosch/detekt/cli/runners/VersionPrinter.kt	100.00% <100.00%> (ø)	2.00 <1.00> (ø)
...b/arturbosch/detekt/core/reporting/OutputFacade.kt	94.11% <100.00%> (ø)	10.00 <0.00> (ø)
... and 33 more

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