Bump version to 1.12.0.2

[lezzago]

Issue #, if available:

Description of changes:
Bump version to 1.12.0.2

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #321 (e1be8e7) into master (37d537d) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #321      +/-   ##
============================================
+ Coverage     79.32%   79.33%   +0.01%     
  Complexity      203      203              
============================================
  Files           151      151              
  Lines          5324     5324              
  Branches        701      701              
============================================
+ Hits           4223     4224       +1     
  Misses          727      727              
+ Partials        374      373       -1     

Impacted Files	Coverage Δ	Complexity Δ
...distroforelasticsearch/alerting/core/JobSweeper.kt	72.19% <0.00%> (+0.53%)	35.00% <0.00%> (ø%)

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