Properly populate versions.properties

[cortinico]

Detekt 1.17.0-RC1 was bundled with a versions.properties that contains just 1.17.0.
This PR fixes this problem using the expand() function of CopySpec. I'm not sure how to write a test for this, but I verified on my Maven Local and the file is populated correctly with 1.17.0-RC1

Fixes #3729

[3flex]

There's a WriteProperties task type that might work better instead (I haven't tried): https://docs.gradle.org/current/javadoc/org/gradle/api/tasks/WriteProperties.html

Want to look at that here as an alternative? Or this could be merged first then I can take a look at that sometime.

[cortinico]

Want to look at that here as an alternative? Or this could be merged first then I can take a look at that sometime.

Thanks for the hint. I've implemented it in f66dc92 and I believe is much nicer that the other approach.

[codecov]

Codecov Report

Merging #3730 (81f3133) into main (50b453b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #3730   +/-   ##
=========================================
  Coverage     78.04%   78.04%           
  Complexity     2883     2883           
=========================================
  Files           473      473           
  Lines          9300     9300           
  Branches       1767     1767           
=========================================
  Hits           7258     7258           
  Misses         1078     1078           
  Partials        964      964           

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