mark configWithFallback as unstable

[marschwar]

Since the api change in #3982 is still under discussion this will allow a 1.1.18 relase without breaking compatibility in 1.1.19.

[codecov]

Codecov Report

Merging #4028 (dec9817) into main (48c1da8) will not change coverage.
The diff coverage is n/a.

❗ Current head dec9817 differs from pull request most recent head 1a20b59. Consider uploading reports for the commit 1a20b59 to get more accurate results

@@            Coverage Diff            @@
##               main    #4028   +/-   ##
=========================================
  Coverage     83.55%   83.55%           
  Complexity     3181     3181           
=========================================
  Files           459      459           
  Lines          9085     9085           
  Branches       1771     1771           
=========================================
  Hits           7591     7591           
  Misses          561      561           
  Partials        933      933           

Impacted Files	Coverage Δ
.../io/gitlab/arturbosch/detekt/api/ConfigProperty.kt	100.00% <ø> (ø)
...bosch/detekt/rules/complexity/LongParameterList.kt	87.75% <ø> (ø)
...rturbosch/detekt/rules/empty/EmptyFunctionBlock.kt	93.33% <ø> (ø)
...sch/detekt/rules/naming/FunctionParameterNaming.kt	90.90% <ø> (ø)
...h/detekt/rules/naming/MemberNameEqualsClassName.kt	84.21% <ø> (ø)

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